Simple Loan Calculator

I need a simple calculator visual basic loan where you can
enter the loan amount, interest rate and the number of years or months, and ouput what continues to be the monthly payment. I will need the correct code and form design. As I said, I want the code to be as simple as possible. I want to be able to watch and understand how it works. Any help will be appreciated.

Your code is here http://www.kidwaresoftware.com/vbfun.htm