Waddell Industries has a past history of uncollectible accounts, as follows. Estimate the allowance for doubtful accounts, based on the aging of receivables schedule you completed in Exercise 8-8.

Age Class

Percent Uncollectible

Not past due .................................0.03

1-30 days past due ..........................4

31-60 days past due .........................15

61-90 days past due .........................35

Over 90 days past due .......................80