You have started a neighborhood cat wash service. You expect to wash 10 cats per month at a cost of $20 per cat. The soap and other supplies will cost $2 per cat. It will cost you $150 to invest in a wash tub and hose. Assuming that you invest the $150 today and that you operate the business for 3 years, what is the NPV of this investment at a discount rate of 6% APR?