Calculate Mortgage Loan APR

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Bids
9
Avg Bid (USD)
$21
Project Budget (USD)
$10 - $30

Project Description:
I need a very simple and clear javascript function that accepts 4 parameters( interestRate, numberOfPayments, paymentAmount, loanAmount ) and returns a number with 3 decimal places(ex: 3.875).

The code should be well commented with well thought out variable names. No globals, 2 space indents(no tabs!), standard best practices, and unit tests would be great although not required.

Additional Project Description:
11/09/2013 at 15:29 PKT
I would like someone to start and finish this asap. I don't have the formula for this so you'll need to figure it out. It is essentially the same as the RATE() function in microsoft excel.

Skills required:
Javascript, Mathematics, Statistics
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