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Norm is trying to help you to help yourself. You can't learn something if people just give you the answer. Especially in programming. Now look at this line off code I quoted and look at how the...

PMT = (P - D)*r/12
______________
(1-(1+r/12)^-m)

Ok this is the formula. Do me a favour and post up what values you are using and the expected result.
Also...

Even try solving the problem, using a pen and paper. Make sure that its correct. For example :
housePrice = 30000.00
downPayment = 5000.00

then write it out like ( ((30000.00 - 50000.00) * ......