E 4-9 Sales-related transactions . After the amount due on a sale of $16,000, terms 2/10,n/eom, is received from a customer within the discount period, the seller consents to the return of the entire shipment. The cost of the merchandise returned was $10,000. (a) What is the amount of the refund owed to the customer? (b) Illustrate the effects on the accounts and financial statements of the return and the refund. A