If Allowance for Doubtful Accounts has a credit balance of $2.100 in the trial balance, journalize the adjusting entry at December 31, assuming uncollectibles are expected to be 10% of accounts receivable. (Credit account titles are automatically indented when amount is entered. Do not indent manually.) If Allowance for Doubtful Accounts has a credit balance of $2.100 in the trial balance, journalize the adjusting entry at December 31, assuming uncollectibles are expected to be 10% of accounts receivable. (Credit account titles are automatically indented when amount is entered. Do not indent manually.)