Explanation:
The journal entries are as follows
1. Account receivable A/c Dr $4,890
To Sales revenue $4,890
(Being the goods are sold on credit)
2. Cost of goods sold $3,490
To Inventory $3,490
(Being the cost of goods is recorded)
3. Sales return and allowance A/c Dr $670
To Accounts receivable $670
(Being sales return is recorded)
4. Inventory $140
To Cost of goods sold $140
(Being sales return is recorded)