Answer:
Time period from September 1 - December 31 is 4 months and this means that the tenant has occupied the place for 4 months. Hence, 4 months rent would be accrued.
12 Month rent amount = $24,000
Per month rent amount = $240,00/12 month = $2,000
So, Rent for 4 months = 4 month * $2,000 = $8,000
Adjusting Entry
Date Account titles Debit Credit
Dec 31 Unearned Rent Revenue $8,000
Rent Revenue $8,000