campus stop, incorporated, 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 $152,070). $ 275,000 b. received merchandise returned by customers as unsatisfactory (but in perfect condition) for cash refund (original cost of merchandise $600). 1,600 c. sold merchandise (costing $9,000) to a customer on account with terms n/30. 20,000 d. collected half of the balance owed by the customer in (c). 10,000 e. granted a partial allowance relating to credit sales the customer in (c) had not yet paid. 1,100 f. anticipate further returns of merchandise (costing $200) after month-end from sales made during the month.