Answer: Please see explanation column for answers
Explanation:
Journal for December 2021
A)To record advance in rent from customers
Date Account. Debit Credit
Dec 31 Deferred 
 Revenue. $2,000
Rent Revenue. $2,000
Reason--->The rent is paid for 2 months in advance ie January and December, but since the adjusting entry is for only December, we will divide .$4000 / 2= 
$2,000 as Rent revenue earned.
B) To record Insurance expense
Date Account. Debit Credit
Dec 31 Insurance 
 Expense. $6,600
 Prepaid insurance $6,600
Reason-- The company paid in advance but we consider only from July to December which is 6months as we are only preparing entry for December
Insurance Expense =13,200x 6/12=
$6600
C) To record accrued Salary
Date Account. Debit Credit
Dec 31 Salary 
 Expense. $3000
 Salary payable $3,000
But will be paid next year.
D) To record accrued interest on loan borriwed
Date Account. Debit Credit
Dec 31 Interest 
 Expense. $250
 Interest payable $250
Calculation 
Interest =PxRxT=15,000 X 10%x 2/12=$250
Accrued interest from date of loan which is November to December the date of journal entry will be considered
E)To record supply expense for the year
Date Account. Debit Credit
Dec 31 Supply 
 Expense. $3,900
 Supply $3,900
Calculation=
Supply expense=Supply at the onset +purchased supply - used supply.
1000 +3400 -500=$3,900