Answer:
$4000
Step-by-step explanation:
The allowance for doubtful accounts balance at the beginning of the year was $4,000 (credit balance)
The allowance for doubtful accounts balance at the end of the year (after adjusting entries) was $3,500 (credit balance)
$ 4000- $3500= $ 500 Bad Debts
Accounts receivable written-off as uncollectible during 2019 amounted to $3,500
Total Bad Debts = $ 500 + $ 3500= $ 4000