Using the method perpetual inventory system, how can I record in the journal entries this transactions:
1-John's purchased merchandise on account for $5000.00. Freight charges of $300.00 were paid in cash.

2-John's returned some of the merchandise purchased in 1. The cost of the merchandise was $600.00 and John's account was credited by the supplier.

3-Merchandise costing $2800.00 was sold for $5200.00 in cash.

I think this a correct answer for # 1. If not can someone tell me..?

Debit credit
1- Inventory... $5300
Accounts payable... $5300

Inventory... $300
Cash... $300

Debit Inventory for 5,300
Credit Cash for 300
Credit Accounts Payable for 5,000