Calculate Interest Earned Code?

Feb 8, 2011

I'm a JavaScript newbie and need help with code.Given principle, yearly interest rate and time in years, I need to calculate interest earned and the ending amount in the account at the end of time.

Formulas:

I=P*R*T
S=P+T

This is what I have which didn't work:

<script type="text/javascript">
var P,R,T,I,S;
P=prompt("enter your Principle","");

[code]...

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