Please explain how to solve b part of this question with the help of BA II Plus Calculator.

Thanks.

A lease of $8,500 had to be repaid with payments of $400 at the beginning of every month. The interest rate charged was 8.50% compounded monthly. a. How many payments are required to repay the debt? It will take payments. Rounded up to the next payment a. How many payments are required to repay tne dept? It will take payments. Rounded up to the next payment b. What is the size of the final payment? ( ) Round to the nearest cent