A simple interest calculator in JavaScript I wrote a long time ago while teaching JavaScript programming in one of the colleges here in the Philippines.
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index.htm
<html>
<style>
body,p {
font-family:arial;
font-size:16px;
font-weight:bolder;
}
.container {
width: 450px;
clear: both;
}
.container input {
width: 100%;
clear: both;
}
</style>
<div class="container">
<body>
<h3> Simple Interest Calculator in JavaScript </h3>
<br/>Principal (P): Php
<input type="text" id="principal" name="principal">
<br>
<br/> Rate (R):
<input type="text" id="rate" name="rate">
<br>
<br/> Time (t):
<input type="text" id="time" name="time">
<br>
<br>
<button onclick="compute_interest()">Compute Interest</button>
<br><br>
<p id="demo"></p>
</div>
<script>
function Commas(n) {
var parts=n.toString().split(".")
return parts[0].replace(/\B(?=(\d{3})+(?!\d))/g, ",") + (parts[1] ? "." + parts[1] : "");
}
function compute_interest() {
var principal = document.getElementById("principal").value;
var rate = document.getElementById("rate").value;
var time = document.getElementById("time").value;
rate2 = parseFloat(rate)/100;
amount_interest = parseFloat(principal) * (1+ (parseFloat(rate2)*time));
amt =amount_interest.toFixed(2);
display = Commas(amt);
results ="Amount to be paid is Php " + display+".";
document.getElementById("demo").innerHTML = results;
}
</script>
</body>
</html>
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