In 2012, MPGJ Wholesale Company had net credit sales of $850,000. On January 1, 2012, Allowance for Doubtful Accounts had a $20,000 credit balance. During 2012, $25,000 of uncollectible accounts receivable were written off. Past experience indicates that the allowance should be 10% of the balance in receivables (percentage of receivables basis). If the accounts receivable balance at December 31 was $350,000, what is the required adjustment to the Allowance for Doubtful Accounts at December 31, 2012?
a) $40,000
b) $35,000
c) $30,000
d) $85,000