I need help on a-2.

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3. value: 10.00 points Karen obtained a $37,000 loan at 3.6% compounded semiannually. a-1. What monthly payment will repay the loan in 7 1/2 years? (Do not round intermediate calculations and round your final answer to 2 decimal places.) Monthly payment $ 469.27 a-2. How much interest will Karen pay over the life of the loan? (Round your final answer to the nearest dollar.) Total interest