Answer:
On July 31st, the Ron show that revenue was earned
Explanation:
Revenue Recognition Principle: Under this principle, the revenue is recorded when it is earned whether cash is collected or not. It records in accruals basis of accounting not in cash basis of accounting
In other words, when service is completed on that date the revenue is recorded in the books of accounts, not with that date on which cash transactions was made or picking up date.
Thus, on July 31st, the Ron show that revenue was earned