12. S & R Company uses the aging of accounts receivable approach to estimate bad debt expense On December 31, 2020, an analysis of accounts receivable revealed the following: December 31, 2020 Accounts Receivable Schedule of Accounts Receivable by Age Age of Accounts Receivable Expected Percentage Uncollectible Allowance for doubtful accounts 140,000 Not yet due 0.75% 60,000 1-30 days past due 4% 19,000 31-60 days past due 10% 5,000 61-90 days past due 60% 7,000 Over 90 days past due 90%