I am interested in buying into an annuity that will return me the following cashflows: . At the end of the first year, I will receive $500. At the end of the second year, I will receive $600. At the end of the third year, I will receive $700. At the end of the fourth year, I will receive $800 It will cost me $2,250 today to buy into the annuity. Assuming a discount rate of 6.5%, what is the NPV of this potential investment? $50.17 None of these $47.11 -$47.11 -$50.17