Rails - Oct 2006 - Payment calculations for fixed rate loans (Excel PMT func?)

All,

I need the Ruby equivalent of the Excel PMT function which will 
calculate a monthly payment amount given an interest rate, a number of 
months, and a present value of the loan amount.

Anyone know where I can find such a beast?

If someone can point me to the formula that Excel uses internally, 
that''s fine too.  I know it isn''t very complicated, but I def.
don''t
know it off hand.

Thanks,
Wes

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