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Modify the compound interest program presented in my JS Control Statements and Loops slides (p. 16-18) so that it calculates and displays the amount of money in the account and the amount accumulated from the interest at the end of each year using an html form for the corresponding input and output. The input boxes can be labeled "Principal", "Rate" and "Years". The two output boxes can be labeled “Amount” and “Interest”. The form should provide also two buttons “Calculate” and “Clear” as shown below.

? oxy ?How Your Investment Gro How Your Investment Gr x How YOUR IVESTMENT GROwS Principal 2000 Rate 5 Years 10 Amount 3257.79 Interest 1257.79 Calculate Clear Click Refresh (or Reload) to run this script again.

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Answer #1

//Code to copy

<html>

<head>
<title>Web App for Compound Interest Calculation</title>

<script type="text/javascript">
function calculate() {
p = document.getElementById("principal").value;
r = document.getElementById("rate").value;
t = document.getElementById("years").value;
n = 1;
// A = p * [[1 + (r/n)] ^ nt]
A = (p * Math.pow((1 + (r / (n * 100))), (n * t)));

//rounding to 2 decimal places
document.getElementById('amount').value = A.toFixed(2).toString();
document.getElementById('interest').value = (A.toFixed(2) - p).toFixed(2);

}

function clear() {
document.getElementById('principal').innerHTML = " ";
document.getElementById('rate').innerHTML = " ";
document.getElementById('years').innerHTML = " ";
document.getElementById('amount').innerHTML = " ";
document.getElementById('interest').innerHTML = " ";


}

</script>
<style>
div {
display: table-row;
}

label,
input {
display: table-cell;
}

</style>
</head>

<body>
<table style="width:100%" border="1" bgcolor="#c0c0c0">
<col align="right">
<col align="left">
<tr>
<td colspan="2" align="center">
<font color="blue">HOW YOUR INVESTMENT GROWS</font>
</td>
</tr>

<tr>
<td>Principal</td>
<td><input id="principal"></td>
</tr>
<tr>
<td>Rate </td>
<td> <input id="rate"></td>
</tr>
<tr>
<td>Years </td>
<td> <input id="years"></td>
</tr>
<tr>
<td> Amount </td>
<td>
<input id="amount">
</td>
</tr>
<tr>
<td>Interest </td>
<td>
<input id="interest">
</td>
</tr>

<tr>
<td><button onclick="calculate()">Calculate</button></td>
<td><button onclick="clear()">Clear</button></td>
</tr>

</table>

</body>

</html>

---------------------------------------------------------------------

Sample Output:

HOW YOUR INVESTMENT GROWS Principal 2000 Rate 5 10 Year Amount 3257.79 Interest 1257.79 CalculateClear

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