Can somebody help me answer these? thanks!

Petersen Book Store entered into the transactions listed below. Prepare Petersen's necessary entries, assuming use of the perpetual inventory system July 6 Purchased $1.600 of merchandise on credit terms 1/30 Returned $100 of the items purchased on July 6 9 Paid freight charges of $90 on the items purchased July 6 19 Sold merchandise on credit for $4,400, terms 1/10, n/30. The merchandise had an inventory cost of $2,700 22 of the merchandise sold on July 19, $300 of it was returned. The items had cost the store $150. 28 Received payment in full from the customer of July 19 31 Paid for the merchandise purchased on July 6