what is the free cash flow

At year-end 2002, Yung.com had notes payable of $1200, accounts payable of $2400, and long-term debt of $4000. Corresponding entries for 2003 are $1600, $2000, and $4000. Asset values are below. During 2003, Yung.com had sales of $3000, cost of goods sold of $400, depreciation of $100, and interest paid of $150. The (average) tax rate is 21% and all taxes are paid currently. Current Asset 2002 2003 Cash $200 $400 Marketable securities 400 300 Accounts receivable 900 800 Inventory 1800 2000 Fixed Assets $7000 $9000 Net Fixed Asset (Plant&Equipment) In 2003, the Free Cash Flow (from Assets) is $