Grayson & Kim Books, is a student co-op. Grayson & Kim Books uses a perpetual inventory system. The following transactions (summarized) have been selected for analysis:

a. Sold merchandise for cash (cost of merchandise $163,270).	$ 297,000
b. Received merchandise returned by customers as unsatisfactory (but in perfect condition) for cash refund (original cost of merchandise $632).	1,720
c. Sold merchandise (costing $9,720) to a customer on account with terms n/30.	21,600
d. Collected half of the balance owed by the customer in (c).	10,800
e. Granted a partial allowance relating to credit sales the customer in (c) had not yet paid.	1,260
f. Anticipate further returns of merchandise (costing $216) after month-end from sales made during the month.	780

3. Prepare journal entries to record transactions (a) to (f). (If no entry is required for a transaction/event, select "No Journal Entry Required" in the first account field.)