The monthly payments for the first three-year term of a $533,713 mortgage loan were based on a 30-year amortization period. The interest rate on the mortgage was 5% compounded semiannually.

1. What was the size of the monthly payment?

2 . What was the principal balance at the end of the three-year term?

3. What would be the size of the monthly payment upon renewal at 3.5% compounded semiannually now amortized over 27 years?