fix: correct syntax error in priceAfterOneYear conversion and update comments

Author: CatchingKiyoko

Sprint-1/3-mandatory-interpret/1-percentage-change.js

@@ -2,7 +2,7 @@ let carPrice = "10,000";
 let priceAfterOneYear = "8,543";
 
 carPrice = Number(carPrice.replaceAll(",", ""));
-priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", ""));
 
 const priceDifference = carPrice - priceAfterOneYear;
 const percentageChange = (priceDifference / carPrice) * 100;
@@ -12,11 +12,27 @@ console.log(`The percentage change is ${percentageChange}`);
 // Read the code and then answer the questions below
 
 // a) How many function calls are there in this file? Write down all the lines where a function call is made
+// Answer: there is three functions being called in this file.
+// 1. Number(carPrice.replaceAll(",", "")) which is on line 4.
+// 2. Number(priceAfterOneYear.replaceAll("," "")) which is on line 5.
+// 3. console.log(`The percentage change is ${percentageChange}`) which is on line 10.
 
 // b) Run the code and identify the line where the error is coming from - why is this error occurring? How can you fix this problem?
+// Answer: An error occurred on line 5 because there was a missing comma in the function call and that was causing a syntax error.
+// To fix this I added the missing comma in the function call on line 5.
 
 // c) Identify all the lines that are variable reassignment statements
+// Answer: there are two variable files are reassignment statements in this file. as we declared the variables on lines 1 and 2 with the let statements.
+// 1. carPrice = Number(carPrice.replaceAll(",", "")); on line 4.
+// 2. priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", "")); on line 5.
 
 // d) Identify all the lines that are variable declarations
+// Answer: there is four variables declared in this file. as they are defined with the statements "let and const".
+// 1. let carPrice = "10,000"; on line 1.
+// 2. let priceAfterOneYear = "8,543"; on line 2.
+// 3. const priceDifference = carPrice - priceAfterOneYear; on line 7.
+// 4. const percentageChange = (priceDifference / carPrice) * 100; on line 8.
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// Answer: this expression converts the string value of carPrice which contains a comma into a number by first removing the comma using the replaceAll method and then converting the resulting string to a number using the Number function. This is necessary because mathematical operations require numeric values and the original value of carPrice is a string with a comma, which would not work correctly in calculations.
+// its purpose is to ensure that the carPrice variable holds a numeric value so that math can be done with the code and be able to work out the percentages.