The balance sheet of Ayayai Company at December 31, 2019, includes the following. Notes receivable $45,600 Accounts receivable 183,100 Less: Allowance for doubtful accounts 21,200 $207,500 Transactions in 2020 include the following. 1. Accounts receivable of $142,400 were collected including accounts of $66,000 on which 3% sales discounts were allowed. 2. $6,210 was received in payment of an account which was written off the books as worthless in 2019. 3. Customer accounts of $21,400 were written off during the year. 4. At year-end, Allowance for Doubtful Accounts was estimated to need a balance of $22,900. This estimate is based on an analysis of aged accounts receivable.