Determine the amount to be paid in full settlement of each of the following invoices, assuming that credit for returns and allowances was received prior to payment and that all invoices were paid within the discount period: Merchandise Freight Paid by Seller Customer Returns and Allowances a. $20,500 - FOB destination, n/30 $4,800 b. 31,100 $560 FOB shipping point, 2/10, n/30 5,900 c. 24,000 - FOB shipping point, 1/10, n/30 1,300 d. 11,000 370 FOB shipping point, 2/10, n/30 1,800 e. 42,200 - FOB destination, 1/10, n/30