Problem - At the end of the current year, the accounts receivable account has a debit balance of $688,000 and sales for the year total $7,800,000.

a. The allowance account before adjustment has a credit balance of $9,300. Bad debt expense is estimated at 1/4 of 1% of sales.

b. The allowance account before adjustment has a credit balance of $9,300. An aging of the accounts in the customer ledger indicates estimated doubtful accounts of $29,800.

c. The allowance account before adjustment has a debit balance of $7,400. Bad debt expense is estimated at 1/2 of 1% of sales.

d. The allowance account before adjustment has a debit balance of $7,400. An aging of the accounts in the customer ledger indicates estimated doubtful accounts of $61,400.

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