Details of purchase invoices, including shipping terms, credit terms, and returns, appear below. (Click the icon to view the details of the purchase invoices.) Compute the total amount to be paid in full settlement of each invoice, assuming that credit for returns is granted before the expiration of the discount period and payment is made within the discount period. (Hint: Assume FOB destination freight is included in the invoice price.) (Round your final answers to the nearest whole dollar.) a. The total amount to be paid in full settlement of invoice a is