An installment contract for the purchase of a car requires payments of $335.96 at the end of each month for 4.5 years. Interest is 10% per annum compounded monthly. (a) What is the amount financed? (b) How much is the interest cost? (a) The amount financed is 9 (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.) (b) The interest is $ (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.)