Answer:
Adjusting Entry
December 31,
Dr. Service Revenue $3,000
Cr. Unearned Revenue $3,000
Step-by-step explanation:
Using alternate treatment the cash received in advance is recorded as the revenue initially.
On September following entry was performed
Dr. Cash $15,000
Cr. Revenue $15,000
At the end of the year services of 4 months have been performed and the amount of one month's service is received in advance until this date. It needs to be adjusted according to the accrual concept.