Apparently, I am wrong where the Xs are. Can someone help me with the correct answer

Prepare journal entries to record each of the merchandising transactions assuming that the company records purchases using the gross method and a periodic inventory system. (If no entry is required for a transaction/event, select "No journal entry required" in the first account field.) Apr. 1 Sold merchandise for $4,200, with credit terms n/30; invoice dated April 1. The cost of the merchandise is $2,520. Apr. 4 The customer in the April 1 sale returned $500 of merchandise for full credit. The merchandise, which had cost $300, is returned to inventory. Apr. 8 Sold merchandise for $1,600, with credit terms of 1/10, n/30; invoice dated April 8. Cost of the merchandise is $1,120. Apr. 11 Received payment for the amount due from the April 1 sale less the return on April 4. Answer is complete but not entirely correct. No Date General Journal Debit Credit 1 Apr 01 4,200 Accounts receivable Sales 4,200 2 Apr 01 x 2,520 X Cost of goods sold Inventory x 2,520 X w 3 Apr 04 500 Sales returns and allowances Accounts receivable 500 4 Apr 04 x 300 X Inventory Cost of goods sold x 300 x 5 Apr 08 1,600 Accounts receivable Sales 1,600 6 Apr 08 X 1,120 X Cost of goods sold Inventory x 1,120 7 Apr 11 Cash 3,700 Accounts receivable 3,700