Campus Stop, Inc., is a student co-op. Campus Stop uses a perpetual inventory system. The following transactions (summarized) have been selected for analysis: a. Sold merchandise for cash (cost of merchandise $149,510). $ 268,900 b. Received merchandise returned by customers as unsatisfactory (but in perfect condition) for cash refund (original cost of merchandise $760). 1,710 c. Sold merchandise (costing $7,650) to a customer on account with terms n/30. 17,000 d. Collected half of the balance owed by the customer in (c). 8,500 e. Granted a partial allowance relating to credit sales the customer in (c) had not yet paid. 1,740