Answer and Explanation:
The Journal entry is shown below:-
1. Cash A/c Dr, $5,000
To Sales $5,000
(Being the cash sales is recorded)
2. Cost of goods sold A/c Dr, $3,000
To merchandise inventory $3,000
(Being the cost of goods sold is recorded)
3. Sales return and Allowances A/c Dr, $630
To cash $630
(Being the sales return is recorded)
4. Merchandise inventory A/c Dr, $378 (($630 ÷ $5,000) × $3,000)
To Cost of goods sold $378
(Being the cost of sales return and allowances is recorded)