Express Airlines is considering the purchase of an aircraft to supplement its current fleet. In estimating the impact of adding this aircraft to the fleet, management has developed the following expected cash flows:

Year Cash Flow 1 -$ 1,000 2 $ 10,000 3 $ 10,000 4 $ 10,000 5 $ 20,000 6 $ 20,000 7 -$ 30,000 If the discount rate is 10 percent, what is the present value of these estimated flows?