At the beginning of the current period, Penny Worth Corporation had balances in Accounts Receivable of $180,000 and in Allowance for Doubtful Accounts of $8,200 (credit). During the period, Penny Worth had credit sales of $720,000 and collections on account of $686,900. Penny Worth expects a return rate of 5%. Penny Worth uses a perpetual inventory system and determined that the cost of goods sold during the period was $603,000. Penny Worth wrote off as uncollectible, accounts receivable of $6,600.