Looking for formula and correct answer. I am missing something

Littleton Books has the following transactions during May. May 2 Purchases books account from Readers Wholesale for $3,300, terms 1/10, n/30. May 3 Pays cash for freight costs of $200 on books purchased from Readers. May 5 Returns books with a cost of $400 to Readers because part of the order is incorrect. May 10 Pays the full amount due to Readers. May 30 Sells all books purchased on May 2 (less those returned on May 5) for $4,000 on account. Required: 1. Record the transactions of Littleton Books, assuming the company uses a perpetual inventory system. (If no entry is required for a transaction/event, select "No Journal Entry Required" in the first account field.) X Answer is not complete. Debit Credit No Date General Journal Inventory 1 2 3 4 5 May 02 May 03 May 05 May 10 May 30 Accounts Payable Inventory Cash Accounts Payable Inventory Accounts Payable Cash Inventory Accounts Receivable Sales Revenue 33 33 333 3,300 200 400 2,900 3,300 200 400 32,600 x 326 x