At December 31, 2000, Arnold's Appliances reported accounts receivable of $311,000 and allowance for uncollectible accounts of $670, following a 2000 write-off of $6,750 in bad debts. An analysis of Arnold's December 31, 2000, accounts receivable suggests that the allowance for uncollectible accounts should be 2% of accounts receivable. Bad debt expense for 2000 would be?