A company received an invoice for $2674.71 dated August 18 with terms 5/15, 3/30, n/60. (a) If the invoice is paid on September 1, how much is to be paid? (b) If the invoice is paid on September 13, how much is to be paid? (c) If the invoice is paid on October 15, how much is to be paid? (a) The amount to be paid on September 1 is $ (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.) (b) The amount to be paid on September 13 is $ (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.) (c) The amount to be paid on October 15 is $ (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.)