Kirchhoff Industries has a past history of uncollectible accounts, as shown below. Age Class Percent Uncollectible Not past due 1% 1-30 days past due 6 31-60 days past due 20 61-90 days past due 30 Over 90 days past due 45 Estimate the allowance for doubtful accounts, based on the aging of receivables schedule below Kirchhoff Industries Aging of Receivables Schedule Customer Subtotals Conover Industries Keystone Company Moxie Creek Inc. Rainbow Company Swanson Company Totals Percentage uncollectible Balance Not Past Due 1-30 Days Past Due 31-60 Days Past Due 61-90 Days Past Due Over 90 Days Past Due 587,200 346,400 129,200 52,800 29,400 29,400 15,100 15,100 16,300 16,300 9,500 9,500 12,100 12,100 23,800 23,800 664,000 370,200 141,300 62,300 45,700 44,500 1% 20% 30% 6% Allowance for Doubtful Accounts