Allowance for Doubtful Accounts has a debit balance of $600 at the end of the year (before adjustment), and bad debt expense is estimated at 4% of credit sales. If cred sales are $670,000, the amount of the adjusting entry for the estimate of the uncollectible accounts Oa. is $26,800 Ob. cannot be determined with the information given Oc. is 5600 Od. is $26,200