Calculator Allowance for Doubtful Accounts has a credit balance of $500 at the end of the year (before adjustment), and bad debt expense is estimated at 3% of credit sales. If credit sales are $300,000, the amount of the adjusting entry to record the estimated uncollectible accounts receivable a. is $9,500 b. is $9,000 c. is $8,500 d. Cannot be determined