Record the following transactions on the books of Cullumber Co. (Omit cost of goods sold entries.) (a) On July 1, Cullumber Co. sold merchandise on account to Stacey Inc. for $20,820, terms 2/10, n/30. (b) On July 8, Stacey Inc. returned merchandise worth $2,520 to Cullumber Co. (c) On July 11, Stacey Inc. paid for the merchandise.