Answer and Explanation:
The journal entries are shown below:
1. No journal entry should be recorded for entered into a contract
2. On April 15
Cash Dr $10,000
To Unearned sales revenue $10,000
(Being advance is recorded)
3. On July 31
Unearned Sales Revenue $10,000
To Sales Revenue $10,000
(Being the unearned sales revenue is recorded)
Cost of Goods Sold $7,500
Inventory $7,500
(Being the cost of a product is recorded)