At the end of the current year, the accounts receivable account has a debit balance of $1,014,000 and sales for the year total $11,490,000.

1. The allowance account before adjustment has a debit balance of $13,700. Bad debt expense is estimated at 1/2 of 1% of sales.
2. The allowance account before adjustment has a debit balance of $13,700. An aging of the accounts in the customer ledger indicates estimated doubtful accounts of $43,800.
3. The allowance account before adjustment has a credit balance of $6,800. Bad debt expense is estimated at 3/4 of 1% of sales.
4. The allowance account before adjustment has a credit balance of $6,800. An aging of the accounts in the customer ledger indicates estimated doubtful accounts of $56,400.

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

a.	$
b.	$
c.	$
d.	$