diff --git a/challengeA/yoshifumi_sawada/.rspec b/challengeA/yoshifumi_sawada/.rspec
new file mode 100644
index 000000000..c99d2e739
--- /dev/null
+++ b/challengeA/yoshifumi_sawada/.rspec
@@ -0,0 +1 @@
+--require spec_helper
diff --git a/challengeA/yoshifumi_sawada/Gemfile b/challengeA/yoshifumi_sawada/Gemfile
new file mode 100644
index 000000000..75b60910c
--- /dev/null
+++ b/challengeA/yoshifumi_sawada/Gemfile
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
+
+# gem "rails"
+gem "rspec", ">= 3.0.0"
+gem 'pry', '~> 0.13.1'
\ No newline at end of file
diff --git a/challengeA/yoshifumi_sawada/Gemfile.lock b/challengeA/yoshifumi_sawada/Gemfile.lock
new file mode 100644
index 000000000..224b6b9d3
--- /dev/null
+++ b/challengeA/yoshifumi_sawada/Gemfile.lock
@@ -0,0 +1,32 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    coderay (1.1.3)
+    diff-lcs (1.4.4)
+    method_source (1.0.0)
+    pry (0.13.1)
+      coderay (~> 1.1)
+      method_source (~> 1.0)
+    rspec (3.10.0)
+      rspec-core (~> 3.10.0)
+      rspec-expectations (~> 3.10.0)
+      rspec-mocks (~> 3.10.0)
+    rspec-core (3.10.1)
+      rspec-support (~> 3.10.0)
+    rspec-expectations (3.10.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.10.0)
+    rspec-mocks (3.10.2)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.10.0)
+    rspec-support (3.10.2)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  pry (~> 0.13.1)
+  rspec (>= 3.0.0)
+
+BUNDLED WITH
+   2.1.4
diff --git a/challengeA/yoshifumi_sawada/csv/jxtg/basic_charge.csv b/challengeA/yoshifumi_sawada/csv/jxtg/basic_charge.csv
new file mode 100644
index 000000000..35092f505
--- /dev/null
+++ b/challengeA/yoshifumi_sawada/csv/jxtg/basic_charge.csv
@@ -0,0 +1,5 @@
+amp,basic_charge
+30,858
+40,1144
+50,1430
+60,1716
\ No newline at end of file
diff --git a/challengeA/yoshifumi_sawada/csv/jxtg/usage_charge.csv b/challengeA/yoshifumi_sawada/csv/jxtg/usage_charge.csv
new file mode 100644
index 000000000..77bea28a8
--- /dev/null
+++ b/challengeA/yoshifumi_sawada/csv/jxtg/usage_charge.csv
@@ -0,0 +1,5 @@
+kwh_from,kwh_to,unit_price
+0,120,19.88
+120,300,26.48
+300,600,25.08
+600,Float::INFINITY,26.15
\ No newline at end of file
diff --git a/challengeA/yoshifumi_sawada/csv/loop/basic_charge.csv b/challengeA/yoshifumi_sawada/csv/loop/basic_charge.csv
new file mode 100644
index 000000000..76d887d02
--- /dev/null
+++ b/challengeA/yoshifumi_sawada/csv/loop/basic_charge.csv
@@ -0,0 +1,8 @@
+amp,basic_charge
+10,0
+15,0
+20,0
+30,0
+40,0
+50,0
+60,0
\ No newline at end of file
diff --git a/challengeA/yoshifumi_sawada/csv/loop/usage_charge.csv b/challengeA/yoshifumi_sawada/csv/loop/usage_charge.csv
new file mode 100644
index 000000000..bb518b91a
--- /dev/null
+++ b/challengeA/yoshifumi_sawada/csv/loop/usage_charge.csv
@@ -0,0 +1,2 @@
+kwh,unit_price
+0,26.4
\ No newline at end of file
diff --git a/challengeA/yoshifumi_sawada/csv/plans.csv b/challengeA/yoshifumi_sawada/csv/plans.csv
new file mode 100644
index 000000000..43c837c53
--- /dev/null
+++ b/challengeA/yoshifumi_sawada/csv/plans.csv
@@ -0,0 +1,5 @@
+provider_name,plan_name
+東京電力エナジーパートナー,従量電灯B
+Looopでんき,おうちプラン
+東京ガス,ずっとも電気１
+JXTGでんき,従量電灯B たっぷりプラン
\ No newline at end of file
diff --git a/challengeA/yoshifumi_sawada/csv/tokyo_energy_partner/basic_charge.csv b/challengeA/yoshifumi_sawada/csv/tokyo_energy_partner/basic_charge.csv
new file mode 100644
index 000000000..7794806e8
--- /dev/null
+++ b/challengeA/yoshifumi_sawada/csv/tokyo_energy_partner/basic_charge.csv
@@ -0,0 +1,8 @@
+amp,basic_charge
+10,286
+15,429
+20,572
+30,858
+40,1144
+50,1430
+60,1716
\ No newline at end of file
diff --git a/challengeA/yoshifumi_sawada/csv/tokyo_energy_partner/usage_charge.csv b/challengeA/yoshifumi_sawada/csv/tokyo_energy_partner/usage_charge.csv
new file mode 100644
index 000000000..0a2ef5685
--- /dev/null
+++ b/challengeA/yoshifumi_sawada/csv/tokyo_energy_partner/usage_charge.csv
@@ -0,0 +1,4 @@
+kwh_from,kwh_to,unit_price
+0,120,19.88
+120,300,26.48
+300,Float::INFINITY,30.57
\ No newline at end of file
diff --git a/challengeA/yoshifumi_sawada/csv/tokyogas/basic_charge.csv b/challengeA/yoshifumi_sawada/csv/tokyogas/basic_charge.csv
new file mode 100644
index 000000000..35092f505
--- /dev/null
+++ b/challengeA/yoshifumi_sawada/csv/tokyogas/basic_charge.csv
@@ -0,0 +1,5 @@
+amp,basic_charge
+30,858
+40,1144
+50,1430
+60,1716
\ No newline at end of file
diff --git a/challengeA/yoshifumi_sawada/csv/tokyogas/usage_charge.csv b/challengeA/yoshifumi_sawada/csv/tokyogas/usage_charge.csv
new file mode 100644
index 000000000..d7d2ea290
--- /dev/null
+++ b/challengeA/yoshifumi_sawada/csv/tokyogas/usage_charge.csv
@@ -0,0 +1,4 @@
+kwh_from,kwh_to,unit_price
+0,140,23.67
+140,350,23.88
+350,Float::INFINITY,26.41
\ No newline at end of file
diff --git a/challengeA/yoshifumi_sawada/lib/basic_charge.rb b/challengeA/yoshifumi_sawada/lib/basic_charge.rb
new file mode 100644
index 000000000..6b4a21843
--- /dev/null
+++ b/challengeA/yoshifumi_sawada/lib/basic_charge.rb
@@ -0,0 +1,39 @@
+require "csv"
+require "pry"
+
+class Basic_charge
+  def self.import(path)
+    if path[:path].include?("tokyo_energy_partner")
+    CSV.read("csv/tokyo_energy_partner/basic_charge.csv", headers: true).map do |row|
+      {
+        amp: row["amp"].to_i,
+        basic_charge: row["basic_charge"].to_i
+      }
+    end
+
+    elsif path[:path].include?("loop")
+    CSV.read("csv/loop/basic_charge.csv", headers: true).map do |row|
+      {
+        amp: row["amp"].to_i,
+        basic_charge: row["basic_charge"].to_i
+      }
+    end
+
+    elsif path[:path].include?("tokyogas")
+    CSV.read("csv/tokyogas/basic_charge.csv", headers: true).map do |row|
+      {
+        amp: row["amp"].to_i,
+        basic_charge: row["basic_charge"].to_i
+      }
+    end
+
+    elsif path[:path].include?("jxtg")
+    CSV.read("csv/jxtg/basic_charge.csv", headers: true).map do |row|
+      {
+        amp: row["amp"].to_i,
+        basic_charge: row["basic_charge"].to_i
+      }
+    end
+  end
+end
+end
\ No newline at end of file
diff --git a/challengeA/yoshifumi_sawada/lib/plan.rb b/challengeA/yoshifumi_sawada/lib/plan.rb
new file mode 100644
index 000000000..6e8b58f49
--- /dev/null
+++ b/challengeA/yoshifumi_sawada/lib/plan.rb
@@ -0,0 +1,14 @@
+require "csv"
+require "pry"
+
+class Plan
+  def self.import(path)
+    # 全てを読込、配列を作成
+    CSV.read("csv/plans.csv", headers: true).map do |row|
+      {
+        provider_name: row["provider_name"],
+        plan_name: row["plan_name"]
+      }
+    end
+  end
+end
\ No newline at end of file
diff --git a/challengeA/yoshifumi_sawada/lib/simulator.rb b/challengeA/yoshifumi_sawada/lib/simulator.rb
new file mode 100644
index 000000000..a3bbcd65d
--- /dev/null
+++ b/challengeA/yoshifumi_sawada/lib/simulator.rb
@@ -0,0 +1,109 @@
+require "pry"
+require_relative "plan"
+require_relative "basic_charge"
+require_relative "usage_charge"
+
+class Simulator
+
+  def initialize(amp,usage_per_month)
+    @amp = amp
+    @usage_per_month = usage_per_month
+  end
+
+  def simulate
+    # 東京電力エナジーパートナー従量電灯Bの電気量料金のCSVデータをインポート
+    usage_datas = Usage_charge.import(path: "../csv/tokyo_energy_partner/usage_charge.csv")
+    # 東京電力エナジーパートナーの従量電灯Bの電気量料金
+    usage_charge1 = calculate(usage_datas)
+    # 東京ガスのずっとも電気１の電気量料金の電気量料金テーブルのCSVデータをインポート
+    usage_datas3 = Usage_charge.import(path: "../csv/tokyogas/usage_charge.csv")
+    # 東京ガスのずっとも電気１の電気量料金
+    usage_charge3 = calculate(usage_datas3)
+
+    # JXTGでんき 従量電灯B たっぷりプランの電気量料金の電気量料金テーブルのCSVデータをインポート
+    usage_datas4 = Usage_charge.import(path: "../csv/jxtg/usage_charge.csv")
+    # 東京ガスのずっとも電気１の電気量料金
+    usage_charge4 = calculate(usage_datas4)
+
+    # Looopでんきのおうちプランの電気量料金テーブルのCSVデータをインポート
+    usage_datas2 = Usage_charge.import(path: "../csv/loop/usage_charge.csv")
+    # Looopでんきのおうちプランの電気量料金の単価
+    usage_charge_data2 = usage_datas2.find { |data| data['kwh'] == 0.0 }
+    unit_price2 = usage_charge_data2["unit_price"]
+
+
+    # 基本料金テーブルのCSVデータをインポート
+    basic_charge_table  = Basic_charge.import(path: "../csv/tokyo_energy_partner/basic_charge.csv")
+    basic_charge_table2 = Basic_charge.import(path: "../csv/loop/basic_charge.csv")
+    basic_charge_table3 = Basic_charge.import(path: "../csv/tokyogas/basic_charge.csv")
+    basic_charge_table4 = Basic_charge.import(path: "../csv/jxtg/basic_charge.csv")
+
+
+    # プロバイダと料金プラン名のCSVデータをインポート
+    plan_datas = Plan.import(path: "csv/plans.csv")
+
+    # 該当プランに価格の計算結果のハッシュを追加
+    plan_list = plan_datas.each do |data|
+      case
+      when data[:provider_name] == "東京電力エナジーパートナー"
+      charge_data = basic_charge_table.find { |data| data[:amp] == @amp }
+      data[:price]= (charge_data[:basic_charge] + usage_charge1).floor.to_s
+
+      when data[:provider_name] == "Looopでんき"
+      charge_data2 = basic_charge_table2.find { |data| data[:amp] == @amp }
+      data[:price]= (charge_data2[:basic_charge] + @usage_per_month * unit_price2).floor.to_s
+
+      when data[:provider_name] == "東京ガス" && [30,40,50,60].include?(@amp)
+      charge_data3 = basic_charge_table3.find { |data| data[:amp] == @amp }
+      data[:price]= (charge_data3[:basic_charge] + usage_charge3).floor.to_s
+
+      when data[:provider_name] == "JXTGでんき" && [30,40,50,60].include?(@amp)
+      charge_data4 = basic_charge_table4.find { |data| data[:amp] == @amp }
+      data[:price]= (charge_data4[:basic_charge] + usage_charge4).floor.to_s
+      end
+    end
+
+    # priceキーに値が入ってるプランのみを表示
+    p output_array = plan_list.select{|plan| plan.has_key?(:price)}
+  end
+
+  private
+
+  # 段階別料金プランの計算
+  def calculate(usage_datas)
+    usage_charge = 0
+    usage_datas.each do |usage_data|
+    if usage_data['kwh_from'] < @usage_per_month && @usage_per_month <= usage_data['kwh_to']
+      usage_charge = usage_charge + usage_data['unit_price'] * (@usage_per_month - usage_data['kwh_from'])
+    elsif usage_data['kwh_to'] < @usage_per_month
+      usage_charge = usage_charge + usage_data['unit_price'] * (usage_data['kwh_to'] - usage_data['kwh_from'])
+    end
+    end
+  return usage_charge
+  end
+end
+
+# #****************実行部分***************************************************************
+
+
+# 契約アンペアを入力して頂く
+while true
+print "契約アンペアを入力して下さい > "
+  amp = gets.to_i
+  break if [10,15,20,30,40,50,60].include?(amp)
+    puts "10,15,20,30,40,50,60のいずれかを入力して下さい"
+end
+
+# 1ヶ月あたりの使用量を入力して頂く
+while true
+print "1ヶ月あたりの使用量を入力して下さい > "
+  usage_per_month = gets.to_i
+  break if usage_per_month >= 0
+    puts "0以上の値を入力して下さい"
+end
+
+# 入力値を引数にSimulatorクラスのインスタンスを生成
+simulator = Simulator.new(amp,usage_per_month)
+
+# インスタンスに対してsimulateメソッド(計算メソッド)を実行して出力結果を表示
+simulator.simulate
\ No newline at end of file
diff --git a/challengeA/yoshifumi_sawada/lib/usage_charge.rb b/challengeA/yoshifumi_sawada/lib/usage_charge.rb
new file mode 100644
index 000000000..3648bc68a
--- /dev/null
+++ b/challengeA/yoshifumi_sawada/lib/usage_charge.rb
@@ -0,0 +1,62 @@
+require "csv"
+require "pry"
+class Usage_charge
+  def self.import(path)
+  if path[:path].include?("tokyo_energy_partner")
+    list = []
+    CSV.foreach("csv/tokyo_energy_partner/usage_charge.csv", headers: true) do |row|
+    list << row.to_h.transform_values{|v|
+      case v
+      when "Float::INFINITY"
+        Float::INFINITY
+      else
+        v.to_f
+      end
+    }
+    end
+    return list
+
+  elsif path[:path].include?("loop")
+    list = []
+    CSV.foreach("csv/loop/usage_charge.csv", headers: true) do |row|
+    list << row.to_h.transform_values{|v|
+      case v
+      when "Float::INFINITY"
+        Float::INFINITY
+      else
+        v.to_f
+      end
+    }
+    end
+    return list
+
+  elsif  path[:path].include?("tokyogas")
+    list = []
+    CSV.foreach("csv/tokyogas/usage_charge.csv", headers: true) do |row|
+    list << row.to_h.transform_values{|v|
+      case v
+      when "Float::INFINITY"
+        Float::INFINITY
+      else
+        v.to_f
+      end
+    }
+    end
+    return list
+
+  elsif path[:path].include?("jxtg")
+    list = []
+    CSV.read("csv/jxtg/usage_charge.csv", headers: true).map do |row|
+    list << row.to_h.transform_values{|v|
+      case v
+      when "Float::INFINITY"
+        Float::INFINITY
+      else
+        v.to_f
+      end
+    }
+    end
+    return list
+  end
+  end
+end
\ No newline at end of file
diff --git a/challengeA/yoshifumi_sawada/spec/simulator_spec.rb b/challengeA/yoshifumi_sawada/spec/simulator_spec.rb
new file mode 100644
index 000000000..7890fecfb
--- /dev/null
+++ b/challengeA/yoshifumi_sawada/spec/simulator_spec.rb
@@ -0,0 +1,186 @@
+require_relative '../lib/simulator.rb'
+
+RSpec.describe Simulator do
+  describe "プラン名と料金を含む配列数と段階別の計算結果" do
+    context "20Aの場合" do
+      it "20A/120kWhの場合、配列数2つ" do
+        simulator = Simulator.new(20, 120)
+        expect(simulator.simulate).to contain_exactly(
+          {:provider_name=>"東京電力エナジーパートナー", :plan_name=>"従量電灯B", :price=>"2957"},
+          {:provider_name=>"Looopでんき", :plan_name=>"おうちプラン", :price=>"3168"}
+        )
+      end
+      it "20A/121kWhの場合、配列数2つ" do
+        simulator = Simulator.new(20, 121)
+        expect(simulator.simulate).to contain_exactly(
+          {:provider_name=>"東京電力エナジーパートナー", :plan_name=>"従量電灯B", :price=>"2984"},
+          {:provider_name=>"Looopでんき", :plan_name=>"おうちプラン", :price=>"3194"}
+        )
+      end
+      it "20A/300kWhの場合、配列数2つ" do
+        simulator = Simulator.new(20, 300)
+        expect(simulator.simulate).to contain_exactly(
+          {:provider_name=>"東京電力エナジーパートナー", :plan_name=>"従量電灯B", :price=>"7724"},
+          {:provider_name=>"Looopでんき", :plan_name=>"おうちプラン", :price=>"7920"}
+        )
+      end
+      it "20A/301kWhの場合、配列数2つ" do
+        simulator = Simulator.new(20, 301)
+        expect(simulator.simulate).to contain_exactly(
+          {:provider_name=>"東京電力エナジーパートナー", :plan_name=>"従量電灯B", :price=>"7754"},
+          {:provider_name=>"Looopでんき", :plan_name=>"おうちプラン", :price=>"7946"}
+        )
+      end
+    end
+
+    context "30Aの場合" do
+      it "30A/140kWhの場合、配列数4つ" do
+        simulator = Simulator.new(30, 140)
+        expect(simulator.simulate).to contain_exactly(
+          {:provider_name=>"東京電力エナジーパートナー", :plan_name=>"従量電灯B", :price=>"3773"},
+          {:provider_name=>"Looopでんき", :plan_name=>"おうちプラン", :price=>"3696"},
+          {:provider_name=>"東京ガス", :plan_name=>"ずっとも電気１", :price=>"4171"},
+          {:provider_name=>"JXTGでんき", :plan_name=>"従量電灯B たっぷりプラン", :price=>"3773"}
+        )
+      end
+      it "30A/141kWhの場合、配列数4つ" do
+        simulator = Simulator.new(30, 141)
+        expect(simulator.simulate).to contain_exactly(
+          {:provider_name=>"東京電力エナジーパートナー", :plan_name=>"従量電灯B", :price=>"3799"},
+          {:provider_name=>"Looopでんき", :plan_name=>"おうちプラン", :price=>"3722"},
+          {:provider_name=>"東京ガス", :plan_name=>"ずっとも電気１", :price=>"4195"},
+          {:provider_name=>"JXTGでんき", :plan_name=>"従量電灯B たっぷりプラン", :price=>"3799"}
+        )
+      end
+      it "30A/300kWhの場合、配列数4つ" do
+        simulator = Simulator.new(30, 300)
+        expect(simulator.simulate).to contain_exactly(
+          {:provider_name=>"東京電力エナジーパートナー", :plan_name=>"従量電灯B", :price=>"8010"},
+          {:provider_name=>"Looopでんき", :plan_name=>"おうちプラン", :price=>"7920"},
+          {:provider_name=>"東京ガス", :plan_name=>"ずっとも電気１", :price=>"7992"},
+          {:provider_name=>"JXTGでんき", :plan_name=>"従量電灯B たっぷりプラン", :price=>"8010"}
+        )
+      end
+      it "30A/301kWhの場合、配列数4つ" do
+        simulator = Simulator.new(30, 301)
+        expect(simulator.simulate).to contain_exactly(
+          {:provider_name=>"東京電力エナジーパートナー", :plan_name=>"従量電灯B", :price=>"8040"},
+          {:provider_name=>"Looopでんき", :plan_name=>"おうちプラン", :price=>"7946"},
+          {:provider_name=>"東京ガス", :plan_name=>"ずっとも電気１", :price=>"8016"},
+          {:provider_name=>"JXTGでんき", :plan_name=>"従量電灯B たっぷりプラン", :price=>"8035"}
+        )
+      end
+      it "30A/350kWhの場合、配列数4つ" do
+        simulator = Simulator.new(30, 350)
+        expect(simulator.simulate).to contain_exactly(
+          {:provider_name=>"東京電力エナジーパートナー", :plan_name=>"従量電灯B", :price=>"9538"},
+          {:provider_name=>"Looopでんき", :plan_name=>"おうちプラン", :price=>"9240"},
+          {:provider_name=>"東京ガス", :plan_name=>"ずっとも電気１", :price=>"9186"},
+          {:provider_name=>"JXTGでんき", :plan_name=>"従量電灯B たっぷりプラン", :price=>"9264"}
+        )
+      end
+      it "30A/351kWhの場合、配列数4つ" do
+        simulator = Simulator.new(30, 351)
+        expect(simulator.simulate).to contain_exactly(
+          {:provider_name=>"東京電力エナジーパートナー", :plan_name=>"従量電灯B", :price=>"9569"},
+          {:provider_name=>"Looopでんき", :plan_name=>"おうちプラン", :price=>"9266"},
+          {:provider_name=>"東京ガス", :plan_name=>"ずっとも電気１", :price=>"9213"},
+          {:provider_name=>"JXTGでんき", :plan_name=>"従量電灯B たっぷりプラン", :price=>"9289"}
+        )
+      end
+      it "30A/600kWhの場合、配列数4つ" do
+        simulator = Simulator.new(30, 600)
+        expect(simulator.simulate).to contain_exactly(
+          {:provider_name=>"東京電力エナジーパートナー", :plan_name=>"従量電灯B", :price=>"17181"},
+          {:provider_name=>"Looopでんき", :plan_name=>"おうちプラン", :price=>"15840"},
+          {:provider_name=>"東京ガス", :plan_name=>"ずっとも電気１", :price=>"15789"},
+          {:provider_name=>"JXTGでんき", :plan_name=>"従量電灯B たっぷりプラン", :price=>"15534"}
+        )
+      end
+      it "30A/601kWhの場合、配列数4つ" do
+        simulator = Simulator.new(30, 601)
+        expect(simulator.simulate).to contain_exactly(
+          {:provider_name=>"東京電力エナジーパートナー", :plan_name=>"従量電灯B", :price=>"17211"},
+          {:provider_name=>"Looopでんき", :plan_name=>"おうちプラン", :price=>"15866"},
+          {:provider_name=>"東京ガス", :plan_name=>"ずっとも電気１", :price=>"15815"},
+          {:provider_name=>"JXTGでんき", :plan_name=>"従量電灯B たっぷりプラン", :price=>"15560"}
+        )
+      end
+    end
+
+    context "40Aの場合" do
+      it "40A/140kWhの場合、配列数4つ" do
+        simulator = Simulator.new(40, 140)
+        expect(simulator.simulate).to contain_exactly(
+          {:provider_name=>"東京電力エナジーパートナー", :plan_name=>"従量電灯B", :price=>"4059"},
+          {:provider_name=>"Looopでんき", :plan_name=>"おうちプラン", :price=>"3696"},
+          {:provider_name=>"東京ガス", :plan_name=>"ずっとも電気１", :price=>"4457"},
+          {:provider_name=>"JXTGでんき", :plan_name=>"従量電灯B たっぷりプラン", :price=>"4059"}
+        )
+      end
+      it "40A/141kWhの場合、配列数4つ" do
+        simulator = Simulator.new(40, 141)
+        expect(simulator.simulate).to contain_exactly(
+          {:provider_name=>"東京電力エナジーパートナー", :plan_name=>"従量電灯B", :price=>"4085"},
+          {:provider_name=>"Looopでんき", :plan_name=>"おうちプラン", :price=>"3722"},
+          {:provider_name=>"東京ガス", :plan_name=>"ずっとも電気１", :price=>"4481"},
+          {:provider_name=>"JXTGでんき", :plan_name=>"従量電灯B たっぷりプラン", :price=>"4085"}
+        )
+      end
+      it "40A/300kWhの場合、配列数4つ" do
+        simulator = Simulator.new(40, 300)
+        expect(simulator.simulate).to contain_exactly(
+          {:provider_name=>"東京電力エナジーパートナー", :plan_name=>"従量電灯B", :price=>"8296"},
+          {:provider_name=>"Looopでんき", :plan_name=>"おうちプラン", :price=>"7920"},
+          {:provider_name=>"東京ガス", :plan_name=>"ずっとも電気１", :price=>"8278"},
+          {:provider_name=>"JXTGでんき", :plan_name=>"従量電灯B たっぷりプラン", :price=>"8296"}
+        )
+      end
+      it "40A/301kWhの場合、配列数4つ" do
+        simulator = Simulator.new(40, 301)
+        expect(simulator.simulate).to contain_exactly(
+          {:provider_name=>"東京電力エナジーパートナー", :plan_name=>"従量電灯B", :price=>"8326"},
+          {:provider_name=>"Looopでんき", :plan_name=>"おうちプラン", :price=>"7946"},
+          {:provider_name=>"東京ガス", :plan_name=>"ずっとも電気１", :price=>"8302"},
+          {:provider_name=>"JXTGでんき", :plan_name=>"従量電灯B たっぷりプラン", :price=>"8321"}
+        )
+      end
+      it "40A/350kWhの場合、配列数4つ" do
+        simulator = Simulator.new(40, 350)
+        expect(simulator.simulate).to contain_exactly(
+          {:provider_name=>"東京電力エナジーパートナー", :plan_name=>"従量電灯B", :price=>"9824"},
+          {:provider_name=>"Looopでんき", :plan_name=>"おうちプラン", :price=>"9240"},
+          {:provider_name=>"東京ガス", :plan_name=>"ずっとも電気１", :price=>"9472"},
+          {:provider_name=>"JXTGでんき", :plan_name=>"従量電灯B たっぷりプラン", :price=>"9550"}
+        )
+      end
+      it "40A/351kWhの場合、配列数4つ" do
+        simulator = Simulator.new(40, 351)
+        expect(simulator.simulate).to contain_exactly(
+          {:provider_name=>"東京電力エナジーパートナー", :plan_name=>"従量電灯B", :price=>"9855"},
+          {:provider_name=>"Looopでんき", :plan_name=>"おうちプラン", :price=>"9266"},
+          {:provider_name=>"東京ガス", :plan_name=>"ずっとも電気１", :price=>"9499"},
+          {:provider_name=>"JXTGでんき", :plan_name=>"従量電灯B たっぷりプラン", :price=>"9575"}
+        )
+      end
+      it "40A/600kWhの場合、配列数4つ" do
+        simulator = Simulator.new(40, 600)
+        expect(simulator.simulate).to contain_exactly(
+          {:provider_name=>"東京電力エナジーパートナー", :plan_name=>"従量電灯B", :price=>"17467"},
+          {:provider_name=>"Looopでんき", :plan_name=>"おうちプラン", :price=>"15840"},
+          {:provider_name=>"東京ガス", :plan_name=>"ずっとも電気１", :price=>"16075"},
+          {:provider_name=>"JXTGでんき", :plan_name=>"従量電灯B たっぷりプラン", :price=>"15820"}
+        )
+      end
+      it "40A/601kWhの場合、配列数4つ" do
+        simulator = Simulator.new(40, 601)
+        expect(simulator.simulate).to contain_exactly(
+          {:provider_name=>"東京電力エナジーパートナー", :plan_name=>"従量電灯B", :price=>"17497"},
+          {:provider_name=>"Looopでんき", :plan_name=>"おうちプラン", :price=>"15866"},
+          {:provider_name=>"東京ガス", :plan_name=>"ずっとも電気１", :price=>"16101"},
+          {:provider_name=>"JXTGでんき", :plan_name=>"従量電灯B たっぷりプラン", :price=>"15846"}
+        )
+      end
+    end
+  end
+end
\ No newline at end of file
diff --git a/challengeA/yoshifumi_sawada/spec/spec_helper.rb b/challengeA/yoshifumi_sawada/spec/spec_helper.rb
new file mode 100644
index 000000000..251aa5106
--- /dev/null
+++ b/challengeA/yoshifumi_sawada/spec/spec_helper.rb
@@ -0,0 +1,100 @@
+# This file was generated by the `rspec --init` command. Conventionally, all
+# specs live under a `spec` directory, which RSpec adds to the `$LOAD_PATH`.
+# The generated `.rspec` file contains `--require spec_helper` which will cause
+# this file to always be loaded, without a need to explicitly require it in any
+# files.
+#
+# Given that it is always loaded, you are encouraged to keep this file as
+# light-weight as possible. Requiring heavyweight dependencies from this file
+# will add to the boot time of your test suite on EVERY test run, even for an
+# individual file that may not need all of that loaded. Instead, consider making
+# a separate helper file that requires the additional dependencies and performs
+# the additional setup, and require it from the spec files that actually need
+# it.
+#
+# See http://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration
+RSpec.configure do |config|
+  # rspec-expectations config goes here. You can use an alternate
+  # assertion/expectation library such as wrong or the stdlib/minitest
+  # assertions if you prefer.
+  config.expect_with :rspec do |expectations|
+    # This option will default to `true` in RSpec 4. It makes the `description`
+    # and `failure_message` of custom matchers include text for helper methods
+    # defined using `chain`, e.g.:
+    #     be_bigger_than(2).and_smaller_than(4).description
+    #     # => "be bigger than 2 and smaller than 4"
+    # ...rather than:
+    #     # => "be bigger than 2"
+    expectations.include_chain_clauses_in_custom_matcher_descriptions = true
+  end
+
+  # rspec-mocks config goes here. You can use an alternate test double
+  # library (such as bogus or mocha) by changing the `mock_with` option here.
+  config.mock_with :rspec do |mocks|
+    # Prevents you from mocking or stubbing a method that does not exist on
+    # a real object. This is generally recommended, and will default to
+    # `true` in RSpec 4.
+    mocks.verify_partial_doubles = true
+  end
+
+  # This option will default to `:apply_to_host_groups` in RSpec 4 (and will
+  # have no way to turn it off -- the option exists only for backwards
+  # compatibility in RSpec 3). It causes shared context metadata to be
+  # inherited by the metadata hash of host groups and examples, rather than
+  # triggering implicit auto-inclusion in groups with matching metadata.
+  config.shared_context_metadata_behavior = :apply_to_host_groups
+
+# The settings below are suggested to provide a good initial experience
+# with RSpec, but feel free to customize to your heart's content.
+=begin
+  # This allows you to limit a spec run to individual examples or groups
+  # you care about by tagging them with `:focus` metadata. When nothing
+  # is tagged with `:focus`, all examples get run. RSpec also provides
+  # aliases for `it`, `describe`, and `context` that include `:focus`
+  # metadata: `fit`, `fdescribe` and `fcontext`, respectively.
+  config.filter_run_when_matching :focus
+
+  # Allows RSpec to persist some state between runs in order to support
+  # the `--only-failures` and `--next-failure` CLI options. We recommend
+  # you configure your source control system to ignore this file.
+  config.example_status_persistence_file_path = "spec/examples.txt"
+
+  # Limits the available syntax to the non-monkey patched syntax that is
+  # recommended. For more details, see:
+  #   - http://rspec.info/blog/2012/06/rspecs-new-expectation-syntax/
+  #   - http://www.teaisaweso.me/blog/2013/05/27/rspecs-new-message-expectation-syntax/
+  #   - http://rspec.info/blog/2014/05/notable-changes-in-rspec-3/#zero-monkey-patching-mode
+  config.disable_monkey_patching!
+
+  # This setting enables warnings. It's recommended, but in some cases may
+  # be too noisy due to issues in dependencies.
+  config.warnings = true
+
+  # Many RSpec users commonly either run the entire suite or an individual
+  # file, and it's useful to allow more verbose output when running an
+  # individual spec file.
+  if config.files_to_run.one?
+    # Use the documentation formatter for detailed output,
+    # unless a formatter has already been configured
+    # (e.g. via a command-line flag).
+    config.default_formatter = "doc"
+  end
+
+  # Print the 10 slowest examples and example groups at the
+  # end of the spec run, to help surface which specs are running
+  # particularly slow.
+  config.profile_examples = 10
+
+  # Run specs in random order to surface order dependencies. If you find an
+  # order dependency and want to debug it, you can fix the order by providing
+  # the seed, which is printed after each run.
+  #     --seed 1234
+  config.order = :random
+
+  # Seed global randomization in this process using the `--seed` CLI option.
+  # Setting this allows you to use `--seed` to deterministically reproduce
+  # test failures related to randomization by passing the same `--seed` value
+  # as the one that triggered the failure.
+  Kernel.srand config.seed
+=end
+end