The interest rate for the first six years of a $30,000 mortgage loan was 3.55% compounded semiannually. The monthly payments computed for a 12-year amortization were rounded to the next higher $10. (Do not round intermediate calculations and round your final answers to 2 decimal places.) a. Calculate the principal balance at the end of the first term. Principal balance $ b. Upon renewal at 6.05% compounded semiannually, monthly payments were calculated for a six-year amortization and again rounded up to the next $10. What will be the amount of the last payment? Final payment $