Coronado Industries uses the percentage-of-receivables basis to record bad debt expense and concludes that 3% of accounts receivable will become uncollectible. Accounts receivable are $385,200 at the end of the year, and the allowance for doubtful accounts has a credit balance of $2,870. (a) Prepare the adjusting journal entry to record bad debt expense for the year. (b) If the allowance for doubtful accounts had a debit balance of $887 instead of a credit balance of $2,870, prepare the adjusting journal entry for bad debt expense.