A company received an invoice for $3505.75 dated September 5 with terms 5/10, 3/30, n/60. (a) If the invoice is paid on September 15, how much is to be paid? (b) If the invoice is paid on October 1, how much is to be paid? (c) If the invoice is paid on November 1, how much is to be paid? (a) The amount to be paid on September 15 is S (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.)