Fix percentage conversion function

Author: Jestavo1

Sprint-3/1-key-errors/1.js

@@ -1,20 +1,28 @@
 // Predict and explain first...
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// Prediction: An error will occur because decimalNumber is already
+// declared as a function parameter and is declared again with const.
+// Also, decimalNumber is being used outside the function where it
+// is not available.
 
 // Try playing computer with the example to work out what is going on
 
 function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
   const percentage = `${decimalNumber * 100}%`;
 
   return percentage;
 }
 
-console.log(decimalNumber);
+console.log(convertToPercentage(0.5));
 
-// =============> write your explanation here
+// Explanation: The function parameter decimalNumber already contains
+// the value we give to the function. We cannot declare another
+// decimalNumber inside the function with const. The original code
+// also tried to use decimalNumber outside the function, where it
+// does not exist.
 
 // Finally, correct the code to fix the problem
-// =============> write your new code here
+
+// New code: The function uses the decimalNumber parameter and returns
+// the percentage. We call the function with 0.5 and log the result.