diff --git a/challengeA/hisato_kataoka/simulater.rb b/challengeA/hisato_kataoka/simulater.rb
new file mode 100644
index 000000000..b37346065
--- /dev/null
+++ b/challengeA/hisato_kataoka/simulater.rb
@@ -0,0 +1,124 @@
+class Simulater
+    
+    # 契約アンペア数と消費電力量から対応するプランと電気料金を計算する。
+    # input  amps:契約アンペア数    consumption:電気料金
+    # return array_plan_info:プロバイダー、プラン名称、電気料金が格納されたハッシュを配列に格納したもの。
+    def simulater(amps, consumption)
+
+        checkamps(amps)
+
+        array_plan_info = []
+
+        array_plan_info.push({"provider" => "東京電力エナジーパートナー", "plan_name" => "従量電灯B", "price" => 0})
+        array_plan_info.push({"provider" => "Loooop電気", "plan_name" => "おうちプラン", "price" => 0})
+        array_plan_info.push({"provider" => "東京ガス株式会社", "plan_name" => "ずっとも電気１", "price" => 0})
+
+        for plan_info in array_plan_info do
+            provider = plan_info["provider"]
+            plan_name = plan_info["plan_name"]
+            plan_info["price"] = cal_base_price(provider,plan_name,amps) + cal_cosumption_price(provider,plan_name,consumption)
+        end
+
+
+        return array_plan_info
+    end
+
+    # 入力された契約アンペア数が適切かチェックし、適切でなければエラーを返す。
+    # input  amps:契約アンペア数
+    def checkamps(amps)
+        targetamps = [10, 15, 20, 30, 40, 50, 60]
+        if(!targetamps.include?(amps))
+            raise "入力されている契約アンペアに対応するプランはありません"
+        end
+    end
+            
+    # 基本料金を計算する。
+    # input  provider:プロバイダー名称    plan_name:プラン名称  amps:契約アンペア数
+    # return 基本料金
+    def cal_base_price(provider, plan_name, amps)
+        if provider === "東京電力エナジーパートナー" && plan_name === "従量電灯B"
+            case amps
+            when 10 
+                return 286
+            when 15 
+                return 429
+            when 20
+                return 572
+            when 30
+                return 858
+            when 40
+                return 1144
+            when 50
+                return 1410
+            when 60
+                return 1716
+            end
+        elsif provider === "Loooop電気" && plan_name === "おうちプラン"
+            return 0
+        elsif provider === "東京ガス株式会社" && plan_name === "ずっとも電気１"
+            if amps <= 30
+                return 858
+            elsif amps === 40
+                return 1144
+            elsif amps === 50
+                return 1410
+            elsif amps === 60
+                return 1716
+            end
+        end
+    end
+
+    # 従量料金を計算する。
+    # input  provider:プロバイダー名称    plan_name:プラン名称  consumption:電気使用量
+    # return price:従量料金
+    def cal_cosumption_price(provider, plan_name, consumption)
+        price = 0
+
+        if provider === "東京電力エナジーパートナー" && plan_name === "従量電灯B"
+            ryokin_kbn1 = 19.88
+            ryokin_kbn2 = 26.48
+            ryokin_kbn3 = 30.57
+            consumption_border_line1 = 120 #使用量境界１
+            consumption_border_line2 = 300 #使用量境界２
+            # 使用量が使用量境界１までの分
+            if consumption <= consumption_border_line1
+                price = consumption * ryokin_kbn1
+            # 使用量が使用量境界１から使用量境界２までの分
+            elsif consumption > consumption_border_line1 && consumption <= consumption_border_line2
+                price = consumption_border_line1 * ryokin_kbn1 + (consumption-consumption_border_line1) * ryokin_kbn2
+            # 使用量が使用量境界２を超える分
+            elsif consumption > consumption_border_line2
+                price = consumption_border_line1 * ryokin_kbn1 + (consumption_border_line2 - consumption_border_line1) * ryokin_kbn2 \
+                         + (consumption - consumption_border_line2) * ryokin_kbn3
+            end
+
+            return price
+
+        elsif provider === "Loooop電気" && plan_name === "おうちプラン"
+            ryokin_kbn1 = 26.4
+            price = consumption * ryokin_kbn1
+
+            return price
+
+        elsif provider === "東京ガス株式会社"  && plan_name === "ずっとも電気１"
+            ryokin_kbn1 = 23.67
+            ryokin_kbn2 = 23.88
+            ryokin_kbn3 = 26.41
+            consumption_border_line1 = 140 #使用量境界１
+            consumption_border_line2 = 350 #使用量境界２
+            # 使用量が使用量境界１までの分
+            if consumption <= consumption_border_line1
+                price = consumption * ryokin_kbn1
+            # 使用量が使用量境界１から使用量境界２までの分
+            elsif consumption > consumption_border_line1 && consumption <= consumption_border_line2
+                price = consumption_border_line1 * ryokin_kbn1 + (consumption-consumption_border_line1) * ryokin_kbn2
+            # 使用量が使用量境界２を超える分
+            elsif consumption > consumption_border_line2
+                price = consumption_border_line1 * ryokin_kbn1 + (consumption_border_line2 - consumption_border_line1) * ryokin_kbn2 \
+                         + (consumption - consumption_border_line2) * ryokin_kbn3
+            end
+
+            return price
+        end
+    end
+end