At the end of the current year, the accounts receivable account has a debit balance of $6,800,000 and sales for the year total $81,500,000. Determine the amount of the adjusting entry to provide for doubtful accounts under each of the following assumptions: a. The allowance account before adjustment has a debit balance of $68,250. Bad debit expense is estimated at of 1% of sales. b. The allowance account before adjustment has a debit balance of $68,250. An aging of the accounts in the customer ledger indicates estimated doubtful accounts of $575,000. c. The allowance account before adjustment has a credit balance of $45,000. Bad debt expense is estimated at of 1% of sales. d. The allowance account before adjustment has a credit balance of $45,000. An aging of the accounts in the customer ledger indicates estimated doubtful accounts of $450,000