At the end of the current year, the accounts receivable account has a debit balance of $1,199,000 and sales for the year total $13,590,000. a. The allowance account before adjustment has a credit balance of $16,200. Bad debt expense is estimated at 3/4 of 1% of sales. b. The allowance account before adjustment has a credit balance of $16,200. An aging of the accounts in the customer ledger indicates estimated doubtful accounts of $51,800. c. The allowance account before adjustment has a debit balance of $8,600. Bad debt expense is estimated at 1/2 of 1% of sales. d. The allowance account before adjustment has a debit balance of $8,600. An aging of the accounts in the customer ledger indicates estimated doubtful accounts of $71,400. 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. $