Answer:
Adjusting entry=$5000
Explanation:
Unearned revenue is revenue that has not been earned. For example in the question above, the advance payment excluding the month of October are unearned.
Rent=$2,500 per month
Unearned amount at October 1=(2500×5)=12500
Earned amount for December 31(October, November and December)=3 months
Earned amount at Dec 31=(2500×3)=7500
Adjusting entry=(Unearned amount-Earned amount)
(12500-7500)=$5000
Unearned amount on December 31=$5000
Earned amount by December 31=$7500