Determining Amounts to be Paid on InvoicesDetermine 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. MerchandiseFreight Paid by Seller Returns and Allowancesa.$19,400 - FOB shipping point, 1/10, n/30$1,000b.9,100 $400 FOB shipping point, 2/10, n/301,100c.6,600 - FOB destination, 2/10, n/30600d.4,400 200 FOB shipping point, 2/10, n/30600e.2,900 - FOB destination, 1/10, n/30-