Using a financial calculator

Hello everyone, I would like to know how to compute the Future Value of N with more than one compounding periods per year on the BA 2 plus. I tried different methods but none seem to work. I appreciate any help.

Divide the interest rate by the number of compounding periods and multiply your number of years by the number of compounding periods.

10% interest compounded semiannually for 20 years would be i = 5% and N = 40.

Thank You very much!