Answer:
a. $4,191
Explanation:
The computation is shown below:
Number of days Receivables % Â Uncollected amount
Current        $68,000   1%     $680
0-30 days    $26,300   5% $1,315
31-60 days    $6,560   10% $656
61-90 days    $3,320   25% $830
Over 90 days   $3,000    50% $1,500
Total       $107,180      $4,981
Now
Allowance for doubtful balance after write off =is
= $3,380 - $2,590 = $790
So, Â
Uncollectible account expense  is
= $4,981 - $790
= $4,191