a. Sold merchandise for cash (cost of merchandise $28,797). $ 51,200 b. Received merchandise returned by customers as unsatisfactory (but in perfect condition) for cash refund (original cost of merchandise $360). 600 c. Sold merchandise (costing $4,750) to a customer on account with terms n/60. 10,000 d. Collected half of the balance owed by the customer in (c). 5,000 e. Granted a partial allowance relating to credit sales the customer in (c) had not yet paid.