Mortgage Payment Formula

I need to find out what the mortgage payment formula is. What i mean is if, i was to borrow 100,000 from the back at 7.75% for 20yrs, how would i get the monthly mortgage payment. I know there is a formula for this but cant find it.

Please help me out.

thanks

Ok i tryed to plug in the numbers to see how it works but havent had any luck.

i have 2 questions
#1. What does n mean in the payments formula?
#2. Where did you get 1200 from in the monthlyinterest?

Thanks for you help

Ok i figured it out, n was -240

A good reference can be found at http://www.mortgagesexposed.com/book...nical_bits.htm and http://www.mortgagesexposed.com/Book.htm