Added missing const variable declaration

Author: Shayida999

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

@@ -27,11 +27,16 @@ carPrice = Number(carPrice.replaceAll(",", ""));
 priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
 
 // d) Identify all the lines that are variable declarations
+
 let carPrice = "10,000";
 let 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?
 replaceAll gets rid of the commas → "10,000" becomes "10000".
+
 Number() turns that string into the number 10000.
+
 so we can do maths with it.