learningJavaScript/chap6assign2.htm at master · NatashaE/learningJavaScript · GitHub

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<!DOCTYPE html>
<html>
<head>
	<title>Chapter 6 Assignment 2</title>

	<script type="text/javascript">
		function monthly_pymt(monthly_int_rate, num_months, loan_amount)
		{
			var base = Math.pow(1 + monthly_int_rate, num_months);
			var payment = (loan_amount * monthly_int_rate / (1-(1/base))).toFixed(2);

			return payment;
		}
		function lb()
		{
			document.write("<br>");
		}

		var vehicle_price = Number(prompt("Please enter the vehicle price")).toFixed(2);;

		var down_payment = Number(prompt("Please enter the down payment amount")).toFixed(2);;

		var annual_int_rate = Number(prompt("Please enter the annual interest rate for the loan"));
	</script>
</head>
<body style="background-color: tan">

	<script type="text/javascript">

		var num_months;
		var loan_amount = (vehicle_price - down_payment).toFixed(2);
		var monthly_int_rate = annual_int_rate / 1200;
		document.write("<h1>Loan Calculator</h1>");
		lb();
		document.write("Vehicle price: $" +vehicle_price);
		lb();
		document.write("Down payment: $" +down_payment);
		lb();
		document.write("Interest Rate: " +annual_int_rate+ "%");
		lb();
		document.write("Loan Amount: $" +loan_amount);
		lb();
		document.write("<pre># of Months	Payment/month</pre>")

		for(var year= 2; year < 6; year ++)
		{
			num_months = year * 12;

			document.write("<pre>  "+num_months+"		  "+ monthly_pymt(monthly_int_rate, num_months, loan_amount)+"</pre>");

		}
	</script>
</body>
</html>