Answer:
The adjusting entry for office supplies on March 31 is:
Dr Cr
Supplies Expense 250
Office Supplies 250
Explanation:
850+450-1,050 = $250
Beginning Supplies $ 850
Add:Purchase during the month $450
Total Supplies Available $ 1,300
Less: Ending Supplies in hand $ 1,050
Supplies Expenses for March $ 250