fix: Calculate percentage change between initial and final car prices

Author: Darkidd77

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

@@ -12,11 +12,30 @@ 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 this file. The lines where a function call is made are:
+// Line 1: carPrice.replaceAll(",", "")
+// Line 2: priceAfterOneYear.replaceAll(",", "")
+// Line 3: Number(carPrice.replaceAll(",", ""))
+// Line 4: Number(priceAfterOneYear.replaceAll(",", ""))
+// Line 5: console.log(`The percentage change is ${percentageChange}`)
 
 // 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 error is occurring in line 5, because it's missing a comma between the two arguments of the replaceAll method. 
+// to fix this problem, we can add a comma between the two arguments: priceAfterOneYear.replaceAll(",", "")
 
 // c) Identify all the lines that are variable reassignment statements
+// there are 2 variable reassignment statements in this file. The lines where a variable reassignment is made are:
+// Line 4 and 5 where we are reassigning new values to the variables 
+// carPrice and priceAfterOneYear after converting them to numbers and removing the commas.
 
 // d) Identify all the lines that are variable declarations
+// there are 4 variable declarations in this file. The lines where a variable declaration is made are:
+// Line 1: let carPrice = "10,000";
+// Line 2: let priceAfterOneYear = "8,543";
+// Line 6: const priceDifference = carPrice - priceAfterOneYear;
+// Line 7: const percentageChange = (priceDifference / carPrice) * 100;
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// To remove the commas from the string carPrice and convert the resulting string to a number. 
+// Then, the Number function is used to convert the resulting string into a number data type,
+//  which can be used for mathematical operations.