Sales-Related Transactions After the amount due on a sale of $21,400, terms 2/10,n/eom, is received from a customer within the discount period, the seller consent to the return of the entire shipment for a cash refund. The cost of the merchandise returned is $12,840. a. What is the amount of the refund owed to the customer? b. Journalize the entries made by the seller to record the return and the refund. If an amount box does not require an entry, leave it blank. (a) ) (b)