very confused please help

Novak'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 $1,010 from Catlin Publishers, terms 2/10,n/30. 3 Sold books on account to Garfunkle Bookstore for $1,240. The cost of the books sold was $740. 6 Received $10 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 $1,400. The cost of the merchandise sold was $690 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 $1,380. The cost of the merchandise sold was $760. 30. Granted General Bookstore $140 credit for books returned costing $90. (To record credit sale) (To record cost of merchandise sold) June 15 June 17 June 17 (To record credit sale) (To record cost of merchandise soid) June 24 June 26 June 28 (To record credit sale) (To record cost of merchandise sold) (To record merchandise returned) (To record cost of merchandise returned)