Answer and Explanation:
The journal entries are shown below:
1. Inventory $1,800
Accounts Payable $1,800
(Being purchased on account)
2. Inventory $50
To Cash $50
(being freight paid)
3. Accounts Payable $51
To Inventory $51
(being the returned calculator is recorded)
4. Accounts Receivable $670
To Sales Revenues $670
(Being sales is recorded)
5. Cost of Goods Sold $460
To Inventory $460
(Being cost of goods sold is recorded)
6. Sales returns $40
To Accounts Receivable $40
(being sales return is recorded)
7. Inventory $28.20
To Cost of Goods Sold $28.20
(Being cost return is recorded)
8. Accounts Receivable $780
To Sales Revenues $780
(Being the sales is recorded)
9. Cost of Goods Sold $560
To Inventory $560
(Being the cost of goods sold is recorded)