Compute the amount to be paid for each of the four separate invoices assuming that all invoices are paid within the discount period. Terms Payment a. b. Merchandise (gross) $ 6,400 $ 22.100 $ 77.800 $ 13,500 2/10, 1/60 1/15, 1/90 1/10, n/30 3/15, 1/45 c. d