diff --git a/code/module-04/m04-end/build/module04.js b/code/module-04/m04-end/build/module04.js
index 1df98a7..df0dd46 100644
--- a/code/module-04/m04-end/build/module04.js
+++ b/code/module-04/m04-end/build/module04.js
@@ -1,19 +1,16 @@
 "use strict";
-/* Module 4: Develop typed functions using TypeScript
-   Lab End  */
+/*  Module 4: Develop typed functions using TypeScript
+    Lab End  */
 /*  TODO: Convert the sortDescending and sortAscending functions to anonymous
-    functions and assign them to variables of the same name. Add types to the
-    parameter lists and return values for each function. */
-/* sortDescending is a comparison function that tells the sort method how to sort
+    functions. */
+/*  sortDescending is a comparison function that tells the sort method how to sort
     numbers in descending order */
 let sortDescending = (a, b) => {
     if (a > b) {
         return -1;
-        ;
     }
     else if (b > a) {
         return 1;
-        ;
     }
     else {
         return 0;
@@ -35,18 +32,17 @@ let sortAscending = (a, b) => {
 /*  The buildArray function builds an array of unique random numbers containing the number
     of items based on the number passed to it. The sortOrder parameter determines
     whether to sort the array in ascending or descending order. */
-/*  TODO: In the BuildArray function, add types to parameter list,
-    return value, and variables. */
+/*  TODO: Update the BuildArray function. */
 function buildArray(items, sortOrder) {
     let randomNumbers = [];
     let nextNumber;
-    for (let i = 0; i < items; i++) {
-        nextNumber = Math.floor(Math.random() * (100 - 1)) + 1;
+    for (let counter = 0; counter < items; counter++) {
+        nextNumber = Math.ceil(Math.random() * (100 - 1));
         if (randomNumbers.indexOf(nextNumber) === -1) {
             randomNumbers.push(nextNumber);
         }
         else {
-            i--;
+            counter--;
         }
     }
     if (sortOrder === 'ascending') {
@@ -61,15 +57,12 @@ let myArray2 = buildArray(8, 'descending');
 console.log(myArray1);
 console.log(myArray2);
 /*  EXERCISE 2
-TODO: Convert the LoanCalc function to TypeScript with strongly typed parameters, variables,
-and return types. Make the numMonths parameter optional but assign it a default value of 12
-months if omitted. */
-function LoanCalc(principle, interestRate, numMonths = 12) {
-    let intr = interestRate / 1200; // Calculates the monthly interest rate 
-    let pmt;
-    Number;
-    pmt = principle * intr / (1 - (Math.pow(1 / (1 + intr), numMonths)));
-    return pmt.toFixed(2);
+    TODO: Update the LoanCalculator function. */
+function loanCalculator(principle, interestRate, months = 12) {
+    let interest = interestRate / 1200; // Calculates the monthly interest rate 
+    let payment;
+    payment = principle * interest / (1 - (Math.pow(1 / (1 + interest), months)));
+    return payment.toFixed(2);
 }
-let myLoan = LoanCalc(1000, 5);
+let myLoan = loanCalculator(1000, 5);
 console.log(myLoan);
diff --git a/code/module-04/m04-end/module04.ts b/code/module-04/m04-end/module04.ts
index 3d3b633..422f4c8 100644
--- a/code/module-04/m04-end/module04.ts
+++ b/code/module-04/m04-end/module04.ts
@@ -13,9 +13,9 @@
     numbers in descending order */
 let sortDescending: compareFunctionType = (a, b) => {
 if (a > b) {
-    return -1;;
+    return -1;
 } else if (b > a) {
-    return 1;;
+    return 1;
 } else {
     return 0;
 }
@@ -67,7 +67,7 @@ console.log(myArray2);
 
 function loanCalculator (principle: number, interestRate: number, months = 12): string {
     let interest: number = interestRate / 1200;   // Calculates the monthly interest rate 
-    let payment; Number;
+    let payment: Number;
     payment = principle * interest / (1 - (Math.pow(1/(1 + interest), months)));
     return payment.toFixed(2);
 }