Answer questions and please correct if A, B, & C are incorrect

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. Merchandise Freight Paid by Seller Returns and Allowances a. $19,300 FOB destination, n/30 $1,000 b. 12,300 $500 1,500 FOB shipping point, 2/10, n/30 FOB shipping point, 2/10, n/30 c. 7,700 700 d. 3,900 200 500 FOB shipping point, 1/10, n/30 FOB destination, 2/10, n/30 e. 3,600 a. 18,300 b. 11,084 c. 6,860 d. s e. $