7. Allowance for Doubtful Accounts has a debit balance of $500 at the end of the year (before adjustment), and uncollectible accounts expense is estimated at 3% of net sales. If net sales are $600,000, the amount of the adjusting entry to record the provision for doubtful accounts is a. $18,500 b. $17,500 c. $18,000 d. none of the above