Answer and Explanation:
The adjusting entries are as follows:
1. Sales returns and allowances $2,400
To Sales refund payable $2,400
(Being the returns and allowance is recorded)
For recording this we debited the sales returns as it increased the sales return and credited the sales refund payable as it increased the liabilities
2. Inventory returns estimated $600
To Cost of goods sold $600
(Being the cost of sales is recorded)
For recording this we debited the inventory returns as it increased the returns inventory and credited the cost of goods sold as it decrease the expenses