Loan Calculator

Hi all,

i’m trying to create a loan calculator and i have things going but i get a NaN result when i hit the calculate button

3 textboxes:

amount
term
interest
total is displayed

on (release)
{
var p:Number = parseInt(amount.text);
var n:Number = parseInt(term.text) * 12;
var r:Number = parseInt(interest.text) / 100;
var a:Number = (p * r * Math.pow(1 + r, n)) / (Math.pow(1 + r, n) - 1);

 total.text = Math.round(a*100)/100;

}

can anyone help me shed some light?