adobe acrobat xHow to calculate monthly payment amounts using adobe acrobat x pro.?

I have a form that has different amounts that come up to a total. I have another field for the term and the interest rate. I need the last box to fill in the monthly payment amount. I have tried everything and can't get it to fill in correctly. Any help wouadobe acrobat xld be appreicated.
Same way you'd cook a roast beef with it - you wouldn't.

Acrobat creates pdf files, it's not programming, so you don't write programs with it. If you want to make a fixed table, just calculate the payment amount for each row (use a calculatadobe acrobat xor) and type the numbers in by hand. If you want the form to do the calculation you'll have to do it in something other than Acrobat. VB or Excel are usable for that. (You'll have to learn a little programming, of course.)