In 2008, the Fitzu Co. had net credit sales of $750,000. On January 1, 2008, Allowance for Doubtful Accounts had a credit balance of $15,000. During 2008, $30,000 of uncollectible accounts receivable were written off. Past experience indicates that the allowance should be 10% of the balance in receivables (percentage of receivable basis). If the accounts receivable balance at December 31 was $200,000, what is the required adjustment to the Allowance for Doubtful Accounts at December 31, 2008? a. $15,000 b. $34,000 c. $35,000 d. $30,000