What amount will be paid in full settlement of Invoice $22392,$ assuming that credit for returns and allowances was received prior to payment and that the invoice was paid within the discount period. Inv. No$.$ Merchandise Freight Paid by Seller$22392$$$7,650$$$120$Freight Terms FOB shipping point,$1/10,$ net $45$Returns and Allowances$$450$ a$.$ $$7,574$ b$.$ $$7,6940$ c$.$ $$7,128$ d$.$ $$7,530$