diff --git a/Challenge09/Challenge09.js b/Challenge09/Challenge09.js
new file mode 100644
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--- /dev/null
+++ b/Challenge09/Challenge09.js
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+"use strict";
+
+// Important Note:
+// Kindly use forEach loop instead of for in all of your solutions
+
+// Resource:
+// forEach: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach
+
+// 1) ---------------------
+//
+//  using the (arrInc) function; increase the provided array values by 10
+//
+//  EX:
+//  [20, 54, 89, 41] ==> [30, 64, 99, 51]
+//
+// ------------------------
+
+const arrInc = (arr) => {
+  let result = [];
+  for (let num of arr) {
+    result.push(parseInt(num) + 10);
+  }
+  return result;
+};
+
+// 2) ---------------------
+//
+//  using the (roundDecimals) function; given an array of decimals round every value to the closest value
+//
+//  EX:
+//  [5.4, 5.5 ,6.7, 6.8] ==> [5, 6, 7, 7]
+//
+// ------------------------
+const roundDecimals = (arr) => {
+  let result = [];
+  for (let num of arr) {
+    result.push(Math.round(parseFloat(num)));
+  }
+  return result;
+};
+
+// 3) ---------------------
+//
+//  An owner of a factory want to give bounce 100$ for the employee of production department who worked *More than* 8 hours
+//  and 50$ for those who worked less, given their data increase their salary and return the data back again
+//
+//  EX:
+// let data = [
+//     {
+//         name: "Robert",
+//         section: "Transport",
+//         workHours: 8,
+//         salaries: "3000$"
+//     },
+//     {
+//         name: "Richard",
+//         section: "HR",
+//         workHours: 6,
+//         salaries: "4000$"
+//     },
+//     {
+//         name: "Christopher",
+//         section: "Production",
+//         workHours: 10
+//         salaries: "4500$"
+//     },
+//     {
+//         name: "Andrew",
+//         section: "HouseKeeping",
+//         workHours: 9,
+//         salaries: "3200$"
+//     }
+// ]
+//
+//  ==>
+//
+// [
+//     {
+//         name: "Robert",
+//         section: "Transport",
+//         workHours: 8,
+//         salaries: "3050$"
+//     },
+//     {
+//         name: "Richard",
+//         section: "HR",
+//         workHours: 6,
+//         salaries: "4050$"
+//     },
+//     {
+//         name: "Christopher",
+//         section: "Production",
+//         workHours: 10
+//         salaries: "4600$"
+//     },
+//     {
+//         name: "Andrew",
+//         section: "HouseKeeping",
+//         workHours: 9,
+//         salaries: "3300$"
+//     }
+// ]
+//
+
+// ------------------------
+const employeesBonus = (arr) => {
+  let result = arr;
+  for (let personObj of result) {
+    if (personObj.workHours > 8) {
+      personObj.salaries = `${(
+        parseInt(personObj.salaries.slice(0, -1)) + 100
+      ).toString()}$`;
+    } else {
+      personObj.salaries = `${(
+        parseInt(personObj.salaries.slice(0, -1)) + 50
+      ).toString()}$`;
+    }
+  }
+  return result;
+};
+
+// 4) ---------------------
+//
+// Harry wants to buy a new mouse and keyboard for his new setup
+// He wants to choose one mouse and one keyboard from the list of prices and take the most expensive combination
+// but his budget is limited, help him by finding the most expensive *price* for a combination to buy with his budget
+//
+// EX:
+//
+// budget = 200$
+// mouseArray = [35, 15, 75, 180, 150, 50]
+// keyBoardArray = [5, 150, 35, 120, 75, 50, 100]
+//
+// ==> 200
+// ------------------------
+const mostExpensive = (budget, mouseArray, keyBoardArray) => {
+  let allPossibleComb = [];
+  for (let mNum of mouseArray) {
+    for (let kNum of keyBoardArray) {
+      if (mNum + kNum <= budget) {
+        allPossibleComb.push(mNum + kNum);
+      }
+    }
+  }
+  return Math.max(...allPossibleComb);
+};
+
+module.exports = { arrInc, roundDecimals, employeesBonus, mostExpensive };
\ No newline at end of file
diff --git a/Challenge09/Challenge09.test.js b/Challenge09/Challenge09.test.js
new file mode 100644
index 0000000..be9c3f8
--- /dev/null
+++ b/Challenge09/Challenge09.test.js
@@ -0,0 +1,126 @@
+"use strict";
+
+const {
+  arrInc,
+  roundDecimals,
+  employeesBonus,
+  mostExpensive,
+} = require("./Challenge09");
+
+const data = [
+  {
+    name: "Robert",
+    section: "Transport",
+    workHours: 8,
+    salaries: "3000$",
+  },
+  {
+    name: "Richard",
+    section: "HR",
+    workHours: 6,
+    salaries: "4000$",
+  },
+  {
+    name: "Christopher",
+    section: "Production",
+    workHours: 10,
+    salaries: "4500$",
+  },
+  {
+    name: "Andrew",
+    section: "HouseKeeping",
+    workHours: 9,
+    salaries: "3200$",
+  },
+];
+
+const res = [
+  {
+    name: "Robert",
+    section: "Transport",
+    workHours: 8,
+    salaries: "3050$",
+  },
+  {
+    name: "Richard",
+    section: "HR",
+    workHours: 6,
+    salaries: "4050$",
+  },
+  {
+    name: "Christopher",
+    section: "Production",
+    workHours: 10,
+    salaries: "4600$",
+  },
+  {
+    name: "Andrew",
+    section: "HouseKeeping",
+    workHours: 9,
+    salaries: "3300$",
+  },
+];
+
+const data2 = [
+  {
+    name: "Jack",
+    section: "Coding",
+    workHours: 6,
+    salaries: "9000$",
+  },
+  {
+    name: "Andrew",
+    section: "Marketing",
+    workHours: 9,
+    salaries: "5000$",
+  },
+];
+
+const res2 = [
+  {
+    name: "Jack",
+    section: "Coding",
+    workHours: 6,
+    salaries: "9050$",
+  },
+  {
+    name: "Andrew",
+    section: "Marketing",
+    workHours: 9,
+    salaries: "5100$",
+  },
+];
+
+describe("Challenge09", () => {
+  test("Array-Increment", () => {
+    expect(arrInc([5, 15, 3, 10, 32])).toStrictEqual([15, 25, 13, 20, 42]);
+    expect(arrInc([6, 0, -10, 33])).toStrictEqual([16, 10, 0, 43]);
+  });
+});
+
+describe("Challenge09", () => {
+  test("Round-Decimals", () => {
+    expect(roundDecimals([5.4, 5.5, 6.7, 6.8])).toStrictEqual([5, 6, 7, 7]);
+    expect(roundDecimals([6.1, 2.3, 5, 2.9])).toStrictEqual([6, 2, 5, 3]);
+  });
+});
+
+describe("Challenge09", () => {
+  test("Employees-Bonus", () => {
+    expect(employeesBonus(data)).toStrictEqual(res);
+    expect(employeesBonus(data2)).toStrictEqual(res2);
+  });
+});
+
+describe("Challenge10", () => {
+  test("Most-Expensive", () => {
+    expect(
+      mostExpensive(
+        200,
+        [35, 15, 75, 180, 150, 50],
+        [5, 150, 35, 120, 75, 50, 100]
+      )
+    ).toStrictEqual(200);
+    expect(mostExpensive(150, [35, 15, 75], [5, 150, 100])).toStrictEqual(135);
+  });
+});