Please answer.

Computing Bad Debts Under the Allowance Method Based on Receivables A company has a credit balance of $600 in its allowance for doubtful accounts before the year-end adjustment for bad debts. The amount of credit sales for the year is $80,000, and the year-end balance in accounts receivable is $15,000. Assume that the expected credit losses are estimated to be 9% of accounts receivable. a. What is (1) bad debt expense for the year and (2) the ending balance in the allowance for doubtful accounts? b. How would the answer to part a change (if at all) if the company had a debit balance of $600 in its allowance for doubtful accounts before the year-end adjustment