create jquery compound calculator
<p>what kind of formula is being used in the calculator mentioned below </p>

<p><a href="https://www.lifeclub.com/public/calculator.aspx" rel="nofollow">https://www.lifeclub.com/public/calculator.aspx</a></p>

<p>i am trying to create a similar calculator using jquery. I am having a tough time getting  the formula right. </p>

<p>how is the interest calculated on the form.
what is the formula</p>

<p>I have tried an attempt at it.. but my numbers do not match theirs 
<a href="http://jsbin.com/oxerez/edit#javascript,html,live" rel="nofollow">http://jsbin.com/oxerez/edit#javascript,html,live</a></p>
