Step-by-step explanation:
The journal entries are shown below:
1. Sales return and Allowances A/c Dr $400
To Account receivable A/c $400
(Being the returned inventory is recorded)
2. Merchandise inventory A/c Dr $100
To Cost of Goods sold A/c $100
(Being the cost of inventory is recorded)
Since the merchandise inventory is returned for $400 and the same is recorded and together with the cost of the merchandise inventory is also recorded