diff --git a/src/transactions.ts b/src/transactions.ts
index f1cd836..e3fb3af 100644
--- a/src/transactions.ts
+++ b/src/transactions.ts
@@ -21,8 +21,8 @@ const transactions: Transaction[] = [
 // filterIncomeTransactions(transactions); // => [["income", 1000], ["income", 1500], ["income", 700]]
 function filterIncomeTransactions(transactions: Transaction[]): Transaction[] {
   // write your code here...
-
-  return []; // replace empty array with what you see is fit
+const incomeArray = transactions.filter((transaction) => transaction[0] === "income")
+  return incomeArray; // replace empty array with what you see is fit
 }
 
 // `filterExpenseTransactions` function that:
@@ -32,8 +32,8 @@ function filterIncomeTransactions(transactions: Transaction[]): Transaction[] {
 // filterExpenseTransactions(transactions); // => [["expense", 500], ["expense", 300]]
 function filterExpenseTransactions(transactions: Transaction[]): Transaction[] {
   // write your code here...
-
-  return []; // replace empty array with what you see is fit
+  const expensesArray = transactions.filter((transaction) => transaction[0] === "expense")
+  return expensesArray; // replace empty array with what you see is fit
 }
 
 // `calculateTotalIncome` function that:
@@ -43,8 +43,11 @@ function filterExpenseTransactions(transactions: Transaction[]): Transaction[] {
 // calculateTotalIncome(transactions); // => 3200  (1000 + 1500 + 700)
 function calculateTotalIncome(transactions: Transaction[]): number {
   // write your code here...
-
-  return -1; // replace -1 with what you see is fit
+  const filteredArray = filterIncomeTransactions(transactions)
+  const total = filteredArray
+  .map((transaction) => transaction[1])
+  .reduce((total,transaction) => total+=transaction, 0)
+  return total; // replace -1 with what you see is fit
 }
 
 // `calculateTotalExpenses` function that:
@@ -54,8 +57,11 @@ function calculateTotalIncome(transactions: Transaction[]): number {
 // calculateTotalExpenses(transactions); // => 800  (500 + 300)
 function calculateTotalExpenses(transactions: Transaction[]): number {
   // write your code here...
-
-  return -1; // replace -1 with what you see is fit
+  const filteredArray = filterExpenseTransactions(transactions)
+  const total = filteredArray
+  .map((transaction) => transaction[1])
+  .reduce((total,transaction) => total+=transaction, 0)
+  return total; // replace -1 with what you see is fit
 }
 
 // `calculateNetTotal` function that:
@@ -66,7 +72,7 @@ function calculateTotalExpenses(transactions: Transaction[]): number {
 function calculateNetTotal(transactions: Transaction[]): number {
   // write your code here...
 
-  return -1; // replace -1 with what you see is fit
+  return calculateTotalIncome(transactions)-calculateTotalExpenses(transactions); // replace -1 with what you see is fit
 }
 
 // `filterSignificantTransactions` function that:
@@ -81,8 +87,7 @@ function filterSignificantTransactions(
   threshold: number
 ): Transaction[] {
   // write your code here...
-
-  return []; // replace empty array with what you see is fit
+  return transactions.filter((transaction) => transaction[1] >= threshold ); // replace empty array with what you see is fit
 }
 
 export {