Estimating Allowance for Doubtful Accounts Kirchhoff Industries has a past history of uncollectible accounts, as follows. Percent Uncollectible Age Class Not past due 1-30 days past due 31-60 days past due 61-90 days past due Over 90 days past due Estimate the allowance for doubtful accounts, based on the aging of receivables Information provided in the chart below. Kirchhoff Industries Estimate the Allowance for Doubtful Accounts Balance Not Past Due Days Past Due 1-30 Days Past Due 31-60 Days Past Due 61-90 Days Past Due Over 90 1,180,000 626,400 266,600 124.000 103,000 60,000 1896 75% Total receivables Percentage uncollectible Allowance for doubtful accounts 40%