<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Input/Output</title>
</head>
<body>
<script>
"use strict";
document.writeln("<strong>" + "Bill Calculation System</strong><br />");
let costPerCredit, numberOfCredits, tuitionCost;
/* Reading values from the user */
costPerCredit = Number(prompt("Enter cost per credit:"));
numberOfCredits = prompt("Enter number of credits:", 15);
/* Computing cost */
tuitionCost = costPerCredit * numberOfCredits;
document.writeln("<strong>Tuition Cost: </strong>" + tuitionCost);
</script>
</body>
</html>