In its 1997 report to Congress, the EPA presented the results of its attempt to discover the Clean Air Act over the period 2000-2020. These actions are estimated to cause benefits of 2000, 2010 and 2020 respectively $90,000, $160,000, $250,000. The costs are $20,000, $53,000, $65,000. Using a discount rate of 5%, calculate net benefits.