Please help me fill out this chart, I am lost. I posted two pictures to show the whole chart.

Concord Warehouse distributes hardback books to retail stores and extends credit to all of its customers. During the month of June, the following merchandising transactions occurred. June 1 Purchased books on account for $1,165 from Catlin Publishers. 3 Sold books on account to Garfunkel Bookstore for $2,000. The cost of the merchandise sold was $750. 6 Received $65 credit for books returned to Catlin Publishers. 9 Paid Catlin Publishers in full. 15 Received payment in full from Garfunkel Bookstore. 17 Sold books on account to Bell Tower for $2,000. The cost of the merchandise sold was $900. 20 Purchased books on account for $750 from Priceless Book Publishers. 24 Received payment in full from Bell Tower. 26 Paid Priceless Book Publishers in full. 28 Sold books on account to General Bookstore for $1,300. The cost of the merchandise sold was $910. 30 Granted General Bookstore $270 credit for books returned costing $85. Prepare a tabular summary to record the transactions for the month of June for Concord Warehouse using a perpetual inventory system. Include margin explanations for the changes in revenues and expenses. (Enter negative amounts using either a negative sign preceding the number e.g. -45 or parentheses e.g. (45).) Concord Warehouse distributes hardback books to retail stores and extends credit to all of its customers. During the month of June, the following merchandising transactions occurred. June 1 Purchased books on account for \$1,165 from Catlin Publishers. 3 Sold books on account to Garfunkel Bookstore for $2,000. The cost of the merchandise sold was $750. 6 Received $65 credit for books returned to Catlin Publishers. 9 Paid Catlin Publishers in full. 15 Received payment in full from Garfunkel Bookstore. 17 Sold books on account to Bell Tower for $2,000. The cost of the merchandise sold was $900. 20 Purchased books on account for $750 from Priceless Book Publishers. 24 Received payment in full from Bell Tower. 26 Paid Priceless Book Publishers in full. 28 Sold books on account to General Bookstore for $1,300. The cost of the merchandise sold was $910. 30 Granted General Bookstore $270 credit for books returned costing $85. Prepare a tabular summary to record the transactions for the month of June for Concord Warehouse using a perpetual inventory system. Include margin explanations for the changes in revenues and expenses. (Enter negative amounts using either a negative sign preceding the number e.g. -45 or parentheses e.g. (45).)