Answer:
$2,100
Step-by-step explanation:
Supplies is a asset which is debited to add, credited to remove
We start with $500, and purchase $2,000, leaving us with $2,500 in supplies.
We have $400 left at the end of the accounting period.
$2,500 - $400 = $2,100 (used)
Therefore, we make our adjustment, and debit the Supplies expense account for $2,100