Kirchhoff Industries has a past history of uncollectible accounts, as shown below. Percent Age Class Not past due 1-30 days past due 31-60 days past due 61-90 days past due Uncollectible 1% 6 20 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 Balance Subtotals 160,000 Not Past 1-30 Days 31-60 Days 61-90 Days Over 90 Days Due Past Due Past Due 727,200 429,000 Past Due Past Due 65,400 36,400 36,400 Conover Industries 16,400 16,400 Keystone Company 22,000 22,000 Moxie Creek Inc. 5,600 5,600 Rainbow Company 8,100 8,100 Swanson Company 29,900 29,900 Total receivables 809,200 458,900 Percentage uncollectible 1% 168,100 6% 71,000 58,400 52,800 20% 30% 45% Allowance for Doubtful Accounts