Can anyone help write this in CF?

It's a mortgage calculation formula and I want to build
a CF-based calculator.

Here's the formula I found:

M = P * ( J / (1 - (1 + J) ** -N))

M is Mortgage Payment
P is  Principal
J is monthly interest in decimal form = I / (12 x 100)
N is the number of months of the loan

I'm not sure how to handle the ** -N part.the exponent.

How would this be written using CF?

Thanks for anyone's help.

Rick



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