On September 1, the beginning of its fiscal year, Campus Office Supply Ltd. had an inventory of 122 calculators at a cost of $20 each. The company uses a perpetual inventory system. During September, the following transactions occurred:

Sept.	2		Purchased 915 calculators for $20 each from Digital Corp. on account, terms n/30.
	10		Returned 29 calculators to Digital for $580 credit because they did not meet specifications.
	11		Sold 420 calculators for $30 each to Campus Book Store, terms n/30. Management estimates returns of 4% based on prior experience.
	14		Granted credit of $870 to Campus Book Store for the return of 29 calculators that were not ordered. The calculators were restored to inventory.
	29		Paid Digital the amount owing.
	30		Received payment in full from the Campus Book Store.