A construction company signed a loan contract at 3.59% compounded semi-annually, with the provision to pay $645 at the end of each month for three years. (a) What is amount of the loan? (b) How much will be owed at the end of eighteen months? (c) How much of the principal will be repaid within the first eighteen months? (d) How much interest is paid during the first eighteen months? (a) The amount of the loan is $ (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.) (b) The amount owed at the end of eighteen months is $ (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.) (c) The amount of principal repaid is $ (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.) (d) The interest paid is $ (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.)