Need help with all parts of the questions please; a,b, c, & d. Show all steps

Providing for Doubtful Accounts At the end of the current year, the accounts receivable account has a debit balance of $940,000 and sales for the year total $10,660,000 a. The allowance account before adjustment has a credit balance of $12,700. Bad debt expense is estimated at 1/4 of 1% of sales. b. The allowance account before adjustment has a credit balance of $12,700. An aging of the accounts in the customer ledger indicates estimated doubtful accounts of $40,600. c. The allowance account before adjustment has a debit balance of $7,500. Bad debt expense is estimated at 3/4 of 1% of sales. d. The allowance account before adjustment has a debit balance of $7,500. An aging of the accounts in the customer ledger indicates estimated doubtful accounts of $62,300. Determine the amount of the adjusting entry to provide for doubtful accounts under each of the assumptions (a through d) listed above