Smithson corporation had a 1/1/08 balance in the allowance for doubtful accounts of $10000. During 2008, it wrote off $7200 of accounts receivable and collected $2100 on accounts previously written off. The balance in accounts receivable was $200000 at 1/1 and $240000 at 12/31. at 12/31/08, smithson estimates that 5% of accounts receivable will prove to be uncollectible. What is the bad debt expense for 2008