Correct variable declarations and function calls

Fixed variable reassignment issues and corrected function call.

Author: mrafeie

Sprint-2/3-mandatory-interpret/1-percentage-change.js

@@ -12,11 +12,26 @@ 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
+// There are 5 function calls in the code:
 
 // 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?
+// The original code has an error here:
+//line 5 : It should be: replaceAll(",", "")
+// There is also another problem: carPrice and priceAfterOneYear
+// are declared with const, so they cannot be reassigned.
+// They should be declared with let if we want to reassign them.
 
 // c) Identify all the lines that are variable reassignment statements
+// carPrice = Number(carPrice.replaceAll(",", ""));
+// priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", ""));
 
 // d) Identify all the lines that are variable declarations
+// const carPrice = "10,000";
+// const priceAfterOneYear = "8,543";
+// const priceDifference = carPrice - priceAfterOneYear;
+// const percentageChange = (priceDifference / carPrice) * 100;
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// First, replaceAll(",", "") removes the comma from "10,000", producing the string "10000".
+// Then Number() converts the string "10000" into the number 10000.
+// This is necessary so that we can perform mathematical calculations with the price.