A $20.00 bank service charge was charged by your bank account for the month of January 31, 2020. Tammany Professional Engineers uses the Percentage of Receivables method to account for bad debt. The following is a summary of Tammanys Accounts Receivable Aging Report. Cash Sales $42,000 Credit Sales $21,000 Allowance for Uncollectible Accounts December 31, 2020 $4,375 Current >30 >60 >90 $115,000 $98,000 $75,000 $15,000 Estimated Uncollectible 1% 2% 4% 5%