Answer:
$ 21,000
Explanation:
To determine the answer we need to preoare a movemnet of the account for uncollectible account.
Opening balance - Allowance for uncollectible accounts      $ 180,000
Add: Bad debt expense for the year                       $  21,000 Â
Available balance of Allowance for uncollectible accounts     $  201,000
Less: Closing balance - Allowance for uncollectible accounts   $  190,000
Actual bad debts written off                              $ 21,000
The bad debts expense for the year is credited to the Allowance for uncollectible accounts and any actual bad debts are debited to this account.