Answer:
Number of days past due Receivables %Uncollectible Uncollectible
Current 56,000 1% 560
0 to 30 23,500 5% 1,175
31 to 60 5,360 10% 536
61 to 90 2,520 25% 630
Over 90 2,200 50% 1,100
Total 89,580 4,001
Uncollectible Amount = 4,001 - Allowance after write off
Allowance after write off = Opening Allowance - Amount written off during year
= 3,020 - 2,390
= $630
Uncollectible Amount = 4,001 - 630
= $3,371