At the end of the current year, the accounts receivable account has a debit balance of $1,140,000 and sales for the year total $12,920,000.

The allowance account before adjustment has a debit balance of $15,400. Bad debt expense is estimated at 3/4 of 1% of sales.

The allowance account before adjustment has a debit balance of $15,400. An aging of the accounts in the customer ledger indicates estimated doubtful accounts of $49,300.

The allowance account before adjustment has a credit balance of $6,900. Bad debt expense is estimated at 1/2 of 1% of sales.

The allowance account before adjustment has a credit balance of $6,900. An aging of the accounts in the customer ledger indicates estimated doubtful accounts of $57,300.

Determine the amount of the adjusting entry to provide for doubtful accounts under each of the assumptions (a through d) listed above.