PE 6-4A Determine the amount to be paid in full settlement of each of two invoices, (a) and (b), assuming that credit for returns and allowances was received prior to payment and that all invoices were paid within the discount period.MerchandiseFreightPaid by SellerFreight TermsReturns andAllowancesa.$90,000$1,000FOB shipping point, 1/10, n/30$15,000b.110,0001,575FOB destination, 2/10, n/308,500PE 6-4B Determine the amount to be paid in full settlement of each of two invoices, (a) and (b), assuming that credit for returns and allowances was received prior to payment...