Chen Company's account balances at December 31, 2007 for Accounts Receivable and the Allowance for Doubtful Accounts are $320,000 debit and $600 credit. Sales during 2007 were $900,000. It is estimated that 1% of sales will be uncollectible. The adjusting entry would include a credit to the allowance account for:
1. $9,600.
2. $9,000.
3. $8,400.
4. $3,200.