In 2022, Patterson Wholesale Company had net credit sales of $750,000. On January 1, 2022, Allowance for Doubtful Accounts had a credit balance of $18,000. During 2022, $30,000 of uncollectible accounts receivable were written off. Past experience indicates that the allowance should be 10% of the balance in receivables. If the accounts receivable balance was $200,000, what is the required adjustment to Allowance for Doubtful Accounts at December 31, 2022?