Determining Amounts to be paid on Invoices 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: Customer Returns Merchandise Freight Paid by Seller $1,100 a b. c. $21,800 10,500 6,700 FOB destination, 1/30 FOB shipping point, 2/10, 1/30 FOB shipping point, 2/10,30 FOB shipping point, 1/10, 1/30 FOB destination, 2/10, 1/30 1.300 600 3,600 500 3,100