Holtzman Corporation had a 1/1/07 balance in the Allowance for Doubtful Accounts of $10,000. During 2007, it wrote off $7,200 of accounts and collected $2,100 on accounts previously written off. The balance in Accounts Receivable was $200,000 at 1/1 and $240,000 at 12/31. At 12/31/07, Holtzman estimates that 5% of accounts receivable will prove to be uncollectible. What is Bad Debt Expense for 2007? Answer is $7,100

Please show me how to get that answer.