Answer:
a. Adjusting Entry for Uncollectible Accounts on December 31, 2021.
Account title
Allowance for uncollectible account $10000 (Debit)
Accounts receivable $10000 (Credit)
b. Write-off of accounts
-Accounts receivable at end= $160000- $110000 = $50000
-Balance at beginning of 2022 in allowance account = $50000 * 25% =$12500
Beginning balance in 2022 $12500
Less: Write off -$10000
Ending balance in 2022 $2500 (Credit)