On average, 5% of credit sales has been uncollectible in the past. At year-end, the Accounts Receivable account balance is $300,000 and the Allowance for Doubtful Accounts balance is $1,500 (credit balance). Net credit sales during the year were $450,000. Using the percentage of credit sales method, what is the ending balance in the Allowance for Doubtful Accounts? $24,000 $15,000 $22,500 . $21.000