4 Harold Hill borrowed $15,500 to pay for his child's education at Riverside Community College. Harold must repay the loan at the end of 18 months in one payment with 31% interest. a. How much interest must Harold pay? (Do not round intermediate calculation. Round your answer to the nearest cent.) Answer is complete but not entirely correct. Interest S 820 83 b. What is the maturity value? (Do not round intermediate calculation. Round your answer to the nearest cent.) Answer is complete but not entirely correct. Matunty value $ 16,320 83