Please help with the following question

Providing for Doubtful Accounts At the end of the current year, the accounts receivable account has a debit balance of $999,000 and sales for the year total $11,330,000. a. The allowance account before adjustment has a credit balance of $13,500. Bad debt expense is estimated at 3/4 of 1% of sales. b. The allowance account before adjustment has a credit balance of $13,500. An aging of the accounts in the customer ledger indicates estimated doubtful accounts of $43,200. c. The allowance account before adjustment has a debit balance of $5,600. Bad debt expense is estimated at 1/4 of 1% of sales. d. The allowance account before adjustment has a debit balance of $5,600. An aging of the accounts in the customer ledger indicates estimated doubtful accounts of $46,500. Determine the amount of the adjusting entry to provide for doubtful accounts under each of the assumptions (a through d) listed above