Karen obtained a $28,000 loan at 4.8% compounded semiannually. a-1. What monthly payment will repay the loan in 8 1/2 years? (Do not round intermediate calculations and round your final answer to 2 decimal places.) Monthly payment $ 334.22 a-2. How much interest will Karen pay over the life of the loan? (Round intermediate calculations to 2 decimal places and round your final answer to the nearest dollar.) Total interest $