At each calendar year-end, Mazie Supply Co. uses the percent of accounts receivable method to estimate bad debts. On December 31, 2013, it has outstanding accounts receivable of $134,000, and it estimates that 4% will be uncollectible.

Prepare the adjusting entry to record bad debts expense for year 2013 under the assumption that the Allowance for Doubtful Accounts has
(a)	a $2,278 credit balance before the adjustment.
(b)	a $670 debit balance before the adjustment.

Adjusting entries (all dated December 31, 2013).