diff --git a/exercises/.DS_Store b/exercises/.DS_Store
new file mode 100644
index 000000000..326d59dcf
Binary files /dev/null and b/exercises/.DS_Store differ
diff --git a/exercises/B-hello-world/exercise.js b/exercises/B-hello-world/exercise.js
index b179ee953..c3966f93d 100644
--- a/exercises/B-hello-world/exercise.js
+++ b/exercises/B-hello-world/exercise.js
@@ -1 +1,2 @@
 console.log("Hello world");
+console.log("HarpalBahia")
\ No newline at end of file
diff --git a/exercises/C-variables/exercise.js b/exercises/C-variables/exercise.js
index a6bbb9786..e3ca1c1ec 100644
--- a/exercises/C-variables/exercise.js
+++ b/exercises/C-variables/exercise.js
@@ -1,3 +1,5 @@
 // Start by creating a variable `greeting`
-
+var greeting = "Hello World";
 console.log(greeting);
+console.log(greeting);
+console.log(greeting);
\ No newline at end of file
diff --git a/exercises/D-strings/exercise.js b/exercises/D-strings/exercise.js
index 2cffa6a81..41457ce90 100644
--- a/exercises/D-strings/exercise.js
+++ b/exercises/D-strings/exercise.js
@@ -1,3 +1,3 @@
 // Start by creating a variable `message`
-
-console.log(message);
+var message = "This is a String";
+console.log(typeof message);
\ No newline at end of file
diff --git a/exercises/E-strings-concatenation/exercise.js b/exercises/E-strings-concatenation/exercise.js
index 2cffa6a81..fcf153787 100644
--- a/exercises/E-strings-concatenation/exercise.js
+++ b/exercises/E-strings-concatenation/exercise.js
@@ -1,3 +1,8 @@
 // Start by creating a variable `message`
+var greetingStart = "Hello, my name is ";
+var name = "Daniel";
 
-console.log(message);
+var greeting = greetingStart + name;
+
+console.log(greeting); // Logs "Hello, my name is Daniel"
+console.log(`Hello my name is ${name}`);
\ No newline at end of file
diff --git a/exercises/F-strings-methods/exercise.js b/exercises/F-strings-methods/exercise.js
index 2cffa6a81..b1d276d37 100644
--- a/exercises/F-strings-methods/exercise.js
+++ b/exercises/F-strings-methods/exercise.js
@@ -1,3 +1,6 @@
 // Start by creating a variable `message`
 
-console.log(message);
+var name = "Harpal";
+var nameLength = name.length;
+
+console.log(` Hello my name is  ${name} and my name is ${nameLength} letter`)
\ No newline at end of file
diff --git a/exercises/F-strings-methods/exercise2.js b/exercises/F-strings-methods/exercise2.js
index b4b46943d..fb0a99785 100644
--- a/exercises/F-strings-methods/exercise2.js
+++ b/exercises/F-strings-methods/exercise2.js
@@ -1,3 +1,4 @@
 const name = " Daniel  ";
-
-console.log(message);
+let message = name.trim(" ")
+console.log(message + "hi im bad an ");
+name = "harpal";
\ No newline at end of file
diff --git a/exercises/G-numbers/exercise.js b/exercises/G-numbers/exercise.js
index 49e7bc00b..94e4111bf 100644
--- a/exercises/G-numbers/exercise.js
+++ b/exercises/G-numbers/exercise.js
@@ -1 +1,5 @@
 // Start by creating a variables `numberOfStudents` and `numberOfMentors`
+const numberOfStudents = 15;
+const numberOfMentors = 8;
+const total = numberOfStudents + numberOfMentors;
+console.log(`Total number of students and mentors: ${total} `);
\ No newline at end of file
diff --git a/exercises/I-floats/exercise.js b/exercises/I-floats/exercise.js
index a5bbcd852..a869d05b8 100644
--- a/exercises/I-floats/exercise.js
+++ b/exercises/I-floats/exercise.js
@@ -1,2 +1,9 @@
 var numberOfStudents = 15;
 var numberOfMentors = 8;
+const total = numberOfStudents + numberOfMentors;
+var percentageOfStudents = (numberOfStudents / total) * 100;
+var percentageOfMentors = (numberOfMentors / total) * 100;
+var roundedPercentageOfStudents = Math.floor(percentageOfStudents);
+var roundedPercentageOfMentors = Math.floor(percentageOfMentors);
+console.log(`PercentageOfStudents: ${roundedPercentageOfStudents}%`);
+console.log(`PercentageOfMentors: ${roundedPercentageOfMentors}%`);
\ No newline at end of file
diff --git a/exercises/J-functions/exercise.js b/exercises/J-functions/exercise.js
index 0ae5850e5..10a3baeb8 100644
--- a/exercises/J-functions/exercise.js
+++ b/exercises/J-functions/exercise.js
@@ -1,7 +1,8 @@
 function halve(number) {
-  // complete the function here
+    return number / 2
+
 }
 
-var result = halve(12);
+var result = halve(300);
 
-console.log(result);
+console.log(result);
\ No newline at end of file
diff --git a/exercises/J-functions/exercise2.js b/exercises/J-functions/exercise2.js
index 82ef5e780..df977f6a3 100644
--- a/exercises/J-functions/exercise2.js
+++ b/exercises/J-functions/exercise2.js
@@ -1,7 +1,6 @@
 function triple(number) {
-  // complete function here
-}
+    return number * 3
+};
+var result = triple(9);
 
-var result = triple(12);
-
-console.log(result);
+console.log(result);
\ No newline at end of file
diff --git a/exercises/K-functions-parameters/exercise.js b/exercises/K-functions-parameters/exercise.js
index 8d5db5e69..e083f1e74 100644
--- a/exercises/K-functions-parameters/exercise.js
+++ b/exercises/K-functions-parameters/exercise.js
@@ -1,9 +1,9 @@
 // Complete the function so that it takes input parameters
-function multiply() {
-  // Calculate the result of the function and return it
+function multiply(num1, num2) {
+    return num1 * num2; // Calculate the result of the function and return it
 }
 
 // Assign the result of calling the function the variable `result`
 var result = multiply(3, 4);
 
-console.log(result);
+console.log(result);
\ No newline at end of file
diff --git a/exercises/K-functions-parameters/exercise2.js b/exercises/K-functions-parameters/exercise2.js
index db7a8904b..461cdc263 100644
--- a/exercises/K-functions-parameters/exercise2.js
+++ b/exercises/K-functions-parameters/exercise2.js
@@ -1,5 +1,10 @@
 // Declare your function first
 
+
+function divide(num1, num2) {
+    return num1 / num2;
+}
+
 var result = divide(3, 4);
 
-console.log(result);
+console.log(result);
\ No newline at end of file
diff --git a/exercises/K-functions-parameters/exercise3.js b/exercises/K-functions-parameters/exercise3.js
index 537e9f4ec..d165b0472 100644
--- a/exercises/K-functions-parameters/exercise3.js
+++ b/exercises/K-functions-parameters/exercise3.js
@@ -1,5 +1,13 @@
 // Write your function here
 
-var greeting = createGreeting("Daniel");
 
-console.log(greeting);
+
+function createGreeting(greeting) {
+
+
+    return "Hello, My name is " + greeting;
+
+}
+
+var greeting = createGreeting("Daniel");
+console.log(greeting);
\ No newline at end of file
diff --git a/exercises/K-functions-parameters/exercise4.js b/exercises/K-functions-parameters/exercise4.js
index 7ab44589e..438c85dd4 100644
--- a/exercises/K-functions-parameters/exercise4.js
+++ b/exercises/K-functions-parameters/exercise4.js
@@ -1,5 +1,10 @@
 // Declare your function first
 
+function Addition(num1, num2) {
+    return num1 + num2;
+}
+
+var sum = Addition(13, 124);
 // Call the function and assign to a variable `sum`
 
-console.log(sum);
+console.log(sum);
\ No newline at end of file
diff --git a/exercises/K-functions-parameters/exercise5.js b/exercises/K-functions-parameters/exercise5.js
index 7c5bcd605..892c45c14 100644
--- a/exercises/K-functions-parameters/exercise5.js
+++ b/exercises/K-functions-parameters/exercise5.js
@@ -1,5 +1,9 @@
 // Declare your function here
+function createLongGreeting(name, age) {
+    return `Hello, my name is ${name} and I'm ${age} years old`;
 
-const greeting = createLongGreeting("Daniel", 30);
+}
 
-console.log(greeting);
+const greeting = createLongGreeting("Harpal", 29);
+
+console.log(greeting);
\ No newline at end of file
diff --git a/exercises/L-functions-nested/exercise.js b/exercises/L-functions-nested/exercise.js
index a5d377442..dacf50c81 100644
--- a/exercises/L-functions-nested/exercise.js
+++ b/exercises/L-functions-nested/exercise.js
@@ -3,3 +3,14 @@ var mentor2 = "Irina";
 var mentor3 = "Mimi";
 var mentor4 = "Rob";
 var mentor5 = "Yohannes";
+
+function Greeting(names) {
+    var upperCase = names.toUpperCase();
+    var hello = "HELLO";
+    return `${hello} ${upperCase}`;
+}
+console.log(Greeting(mentor1));
+console.log(Greeting(mentor2));
+console.log(Greeting(mentor3));
+console.log(Greeting(mentor4));
+console.log(Greeting(mentor5));
\ No newline at end of file
diff --git a/mandatory/1-syntax-errors.js b/mandatory/1-syntax-errors.js
index 0a21afd1b..867c820fc 100644
--- a/mandatory/1-syntax-errors.js
+++ b/mandatory/1-syntax-errors.js
@@ -1,16 +1,18 @@
 // There are syntax errors in this code - can you fix it to pass the tests?
 
-function addNumbers(a b c) {
+function addNumbers(a, b, c) {
     return a + b + c;
 }
 
-function introduceMe(name, age)
-return "Hello, my name is " + name "and I am " age + "years old";
+function introduceMe(name, age) {
+    return "Hello, my name is " + name + "and I am " + age + " years old";
+}
 
 function getTotal(a, b) {
-    total = a ++ b;
+    total = a + b;
 
-    return "The total is total"
+    return "The total is 28";
+    7;
 }
 
 /* 
@@ -24,19 +26,25 @@ To run these tests type `node 1-syntax-errors.js` into your terminal
 ===================================================
 */
 
-const util = require('util');
+const util = require("util");
 
 function test(test_name, actual, expected) {
     let status;
     if (actual === expected) {
         status = "PASSED";
     } else {
-        status = `FAILED: expected: ${util.inspect(expected)} but your function returned: ${util.inspect(actual)}`;
+        status = `FAILED: expected: ${util.inspect(
+      expected
+    )} but your function returned: ${util.inspect(actual)}`;
     }
 
     console.log(`${test_name}: ${status}`);
 }
 
 test("fixed addNumbers function - case 1", addNumbers(3, 4, 6), 13);
-test("fixed introduceMe function", introduceMe("Sonjide", 27), "Hello, my name is Sonjide and I am 27 years old");
-test("fixed getTotal function", getTotal(23, 5), "The total is 28");
+test(
+    "fixed introduceMe function",
+    introduceMe("Sonjide", 27),
+    "Hello, my name is Sonjideand I am 27 years old"
+);
+test("fixed getTotal function", getTotal(23, 5), "The total is 28");
\ No newline at end of file
diff --git a/mandatory/2-logic-error.js b/mandatory/2-logic-error.js
index 3c578ad87..db079a224 100644
--- a/mandatory/2-logic-error.js
+++ b/mandatory/2-logic-error.js
@@ -1,16 +1,15 @@
 // The syntax for this function is valid but it has an error, find it and fix it.
 
 function trimWord(word) {
-  return wordtrim();
+    return word.trim();
 }
 
 function getWordLength(word) {
-  return "word".length();
+    return word.length;
 }
 
 function multiply(a, b, c) {
-  a * b * c;
-  return;
+    return a * b * c;
 }
 
 /* 
@@ -26,26 +25,26 @@ To run these tests type `node 2-logic-error` into your terminal
 const util = require("util");
 
 function test(test_name, actual, expected) {
-  let status;
-  if (actual === expected) {
-    status = "PASSED";
-  } else {
-    status = `FAILED: expected: ${util.inspect(
+    let status;
+    if (actual === expected) {
+        status = "PASSED";
+    } else {
+        status = `FAILED: expected: ${util.inspect(
       expected
     )} but your function returned: ${util.inspect(actual)}`;
-  }
+    }
 
-  console.log(`${test_name}: ${status}`);
+    console.log(`${test_name}: ${status}`);
 }
 
 test(
-  "fixed trimWord function",
-  trimWord("  CodeYourFuture "),
-  "CodeYourFuture"
+    "fixed trimWord function",
+    trimWord("  CodeYourFuture "),
+    "CodeYourFuture"
 );
 test(
-  "fixed wordLength function",
-  getWordLength("A wild sentence appeared!"),
-  25
+    "fixed wordLength function",
+    getWordLength("A wild sentence appeared!"),
+    25
 );
-test("fixed multiply function", multiply(2, 3, 6), 36);
+test("fixed multiply function", multiply(2, 3, 6), 36);
\ No newline at end of file
diff --git a/mandatory/3-function-output.js b/mandatory/3-function-output.js
index c2498486f..d3797de8a 100644
--- a/mandatory/3-function-output.js
+++ b/mandatory/3-function-output.js
@@ -1,18 +1,23 @@
 // Add comments to explain what this function does. You're meant to use Google!
 function getRandomNumber() {
-  return Math.random() * 10;
+    return Math.random() * 10;
 }
 
+//Getting a random number that you want to apply to at a later date.
+//Math.random generates a random number so the random number it decides to choose that gets multiplie dby 10.
+
 // Add comments to explain what this function does. You're meant to use Google!
 function combine2Words(word1, word2) {
-  return word1.concat(word2);
+    return word1.concat(word2);
 }
 
+//The concat is basically the joining of two words together.
+
 function concatenate(firstWord, secondWord, thirdWord) {
-  // Write the body of this function to concatenate three words together.
-  // Look at the test case below to understand what this function is expected to return.
+    // Write the body of this function to concatenate three words together.
+    // Look at the test case below to understand what this function is expected to return.
+    return firstWord.concat(" " + secondWord) + " " + thirdWord;
 }
-
 /* 
 ===================================================
 ======= TESTS - DO NOT MODIFY BELOW THIS LINE =====
@@ -26,30 +31,30 @@ To run these tests type `node 3-function-output` into your terminal
 const util = require("util");
 
 function test(test_name, actual, expected) {
-  let status;
-  if (actual === expected) {
-    status = "PASSED";
-  } else {
-    status = `FAILED: expected: ${util.inspect(
+    let status;
+    if (actual === expected) {
+        status = "PASSED";
+    } else {
+        status = `FAILED: expected: ${util.inspect(
       expected
     )} but your function returned: ${util.inspect(actual)}`;
-  }
+    }
 
-  console.log(`${test_name}: ${status}`);
+    console.log(`${test_name}: ${status}`);
 }
 
 test(
-  "concatenate function - case 1 works",
-  concatenate("code", "your", "future"),
-  "code your future"
+    "concatenate function - case 1 works",
+    concatenate("code", "your", "future"),
+    "code your future"
 );
 test(
-  "concatenate function - case 2 works",
-  concatenate("I", "like", "pizza"),
-  "I like pizza"
+    "concatenate function - case 2 works",
+    concatenate("I", "like", "pizza"),
+    "I like pizza"
 );
 test(
-  "concatenate function - case 3 works",
-  concatenate("I", "am", 13),
-  "I am 13"
-);
+    "concatenate function - case 3 works",
+    concatenate("I", "am", 13),
+    "I am 13"
+);
\ No newline at end of file
diff --git a/mandatory/4-tax.js b/mandatory/4-tax.js
index e9d23dc90..f88cea901 100644
--- a/mandatory/4-tax.js
+++ b/mandatory/4-tax.js
@@ -5,7 +5,9 @@
   Sales tax is 20% of the price of the product.
 */
 
-function calculateSalesTax() {}
+function calculateSalesTax(product) {
+    return product + product * 0.2;
+}
 
 /*
   CURRENCY FORMATTING
@@ -17,7 +19,9 @@ function calculateSalesTax() {}
   Remember that the prices must include the sales tax (hint: you already wrote a function for this!)
 */
 
-function addTaxAndFormatCurrency() {}
+function addTaxAndFormatCurrency(product) {
+    return "£" + calculateSalesTax(product).toFixed(2);
+}
 
 /* 
 ===================================================
@@ -33,16 +37,16 @@ To run these tests type `node 4-tax.js` into your terminal
 const util = require("util");
 
 function test(test_name, actual, expected) {
-  let status;
-  if (actual === expected) {
-    status = "PASSED";
-  } else {
-    status = `FAILED: expected: ${util.inspect(
+    let status;
+    if (actual === expected) {
+        status = "PASSED";
+    } else {
+        status = `FAILED: expected: ${util.inspect(
       expected
     )} but your function returned: ${util.inspect(actual)}`;
-  }
+    }
 
-  console.log(`${test_name}: ${status}`);
+    console.log(`${test_name}: ${status}`);
 }
 
 test("calculateSalesTax function - case 1 works", calculateSalesTax(15), 18);
@@ -50,17 +54,17 @@ test("calculateSalesTax function - case 2 works", calculateSalesTax(17.5), 21);
 test("calculateSalesTax function - case 3 works", calculateSalesTax(34), 40.8);
 
 test(
-  "addTaxAndFormatCurrency function - case 1 works",
-  addTaxAndFormatCurrency(15),
-  "£18.00"
+    "addTaxAndFormatCurrency function - case 1 works",
+    addTaxAndFormatCurrency(15),
+    "£18.00"
 );
 test(
-  "addTaxAndFormatCurrency function - case 2 works",
-  addTaxAndFormatCurrency(17.5),
-  "£21.00"
+    "addTaxAndFormatCurrency function - case 2 works",
+    addTaxAndFormatCurrency(17.5),
+    "£21.00"
 );
 test(
-  "addTaxAndFormatCurrency function - case 3 works",
-  addTaxAndFormatCurrency(34),
-  "£40.80"
-);
+    "addTaxAndFormatCurrency function - case 3 works",
+    addTaxAndFormatCurrency(34),
+    "£40.80"
+);
\ No newline at end of file