I need help with the missing/wrong ones.

Cullumber Company commenced operations on July 1. Cullumber Company uses a periodic inventory system. During July, Cullumber Company was involved in the following transactions and events: July 2 Purchased $14,400 of merchandise from Suppliers Inc. on account, terms 2/10,n/30, FOB shipping point. 3 Returned $1,200 of merchandise to Suppliers Inc. as it was damaged. Received a credit on account from Suppliers. 4 Paid $530 of freight costs on July 2 shipment. 8 Sold merchandise for $2,000 cash. 11 Paid Suppliers Inc. the full amount owing. 15 Sold merchandise for $6,300 on account, 1/10,n/30, FOB shipping point. 25 Received full payment for the merchandise sold on July 15. 31 Cullumber did a physical count and determined there was $9,900 of inventory on hand. Accounts Payable 13,200 Sales Discounts Cash (Payment on account.) Accounts ReceivableAccounts Payable 6,300 July 15 Sales (To record sales on account.) July 25 Cash Sales Discounts Accounts Receivable (Collection on account.)