I am creating a writable form which includes the ability to autopopulate a
given field with a loans monthly payment amount. the Formula is:

Monthly payment = P r(1+r)^n / (1+r)^n-1

P is Principle(loan amount)
r is percentage rate
n is term of loan (months)

I seem to be having problems with word calculating to the power of n
I am doing this with text fields where the user supplies the loan amount (P)
and the term in years (ie: 15 or 30 years) and the annual percentage rate.
I want the monthly payment to be calculated.
What am i doing wrong????!!!!
Please help me.

Steve