Grouper's Warehouse distributes hardback books to retail stores and extends credit terms of 2/10,n/30 to all of its customers. During the month of June, the following merchandising transactions occurred. June 1 Purchased books on account for $1,120 from Catlin Publishers, terms 2/10,n/30. 3 Sold books on account to Garfunkle Bookstore for $1,100. The cost of the books sold was $770. 6 Received $20 credit for books returned to Catlin Publishers. 9 Paid Catlin Publishers in full. 15 Received payment in full from Garfunkle Bookstore. 17 Sold books on account to Bell Tower for $1,200. The cost of the merchandise sold was $710. 20 Purchased books on account for $700 from Priceless Book Publishers, terms 1/15,n/30. 24 Received payment in full from Bell Tower. 26 Paid Priceless Book Publishers in full. 28 Sold books on account to General Bookstore for $1,190. The cost of the merchandise sold was $760. 30 Granted General Bookstore $130 credit for books returned costing $80