diff --git a/index.js b/index.js
index 294f6b2..7fc3b14 100644
--- a/index.js
+++ b/index.js
@@ -8,12 +8,10 @@ const s4 = "bread";
 const s5 = "and";
 
 // Concatenate the string variables into one new string
-
+const tongueTwister = `${s1} ${s2} ${s3} ${s4} ${s5} ${s3} ${s2} ${s1} ${s4} `;
 
 // Print out the concatenated string
-
-
-
+console.log(tongueTwister);
 
 /*******************************************
     Iteration 1.2 | Camel Tail
@@ -23,35 +21,38 @@ const part2 = "script";
 
 // Convert the last letter of part1 and part2 to uppercase and concatenate the strings
 
+const part1LastLetter = part1[part1.length - 1];
+const part1LastLetterToUpper = part1LastLetter.toUpperCase();
+const part1Finished = part1.slice(0, part1.length - 1) + part1LastLetterToUpper;
 
-// Print the cameLtaiL-formatted string
-
+const part2LastLetter = part2[part2.length - 1];
+const part2LastLetterToUpper = part2LastLetter.toUpperCase();
+const part2Finished = part2.slice(0, part2.length - 1) + part2LastLetterToUpper;
 
+const result = part1Finished + part2Finished;
 
+// Print the cameLtaiL-formatted string
+console.log(result);
 
 /*******************************************
     Iteration 2.1 | Calculate Tip
 *******************************************/
 const billTotal = 84;
+const tipPercentage = 15;
 
 // Calculate the tip (15% of the bill total)
-
-
+const tipAmount = (tipPercentage / 100) * billTotal;
 // Print out the tipAmount
-
-
-
+console.log(tipAmount);
 
 /*******************************************
     Iteration 2.2 | Generate Random Number
 *******************************************/
 
 // Generate a random integer between 1 and 10 (inclusive)
-
-
+const randomNumber = Math.ceil(Math.random() * 10);
 // Print the generated random number
-
-
+console.log(randomNumber);
 
 /*******************************************
     Iteration 3.1 | Booleans
@@ -62,15 +63,29 @@ const b = false;
 
 // Try and guess the output of the below expressions first and write your answers down:
 const expression1 = a && b;
+// false
+console.log(expression1);
 
 const expression2 = a || b;
+// true
+console.log(expression2);
 
 const expression3 = !a && b;
+// true WRONG
+console.log(expression3);
 
 const expression4 = !(a && b);
+// true
+console.log(expression4);
 
 const expression5 = !a || !b;
+// true
+console.log(expression5);
 
 const expression6 = !(a || b);
+// false
+console.log(expression6);
 
-const expression7 = a && a;
\ No newline at end of file
+const expression7 = a && a;
+// true
+console.log(expression7);