Net credit sales for the month are $800,000. The accounts receivable balance is $160,000. The allowance is calculated as 7.5% of the receivables balance using the percentage-of-receivables basis. If Allowance for Doubtful Accounts has a credit balance of $5,000 before adjustment, what is the balance after adjustment?

a) $10,500
b) $7,500
c) $5,000
d) $12,500