A debt of $35,500 is repaid by payments of $2,970 made at the end of every six months. Interest is 9.27% compounded monthly (a) What is the number of payments needed to retire the debt? (b) What is the cost of the debt for the first three years? (c) What is the interest paid in the sixth payment period? (d) Construct a partial amortization schedule showing details of the first three payments, the last three payments, and totals. (a) The number of the semi-annual payments is (Round the final answer up to the nearest whole number. Round all intermediate values to six decimal places as needed.)