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The equation for npv=sum (benefits-cost)/(1-r)^t Now if the project occurs over a time horizon of 100 years, and benefits and costs only come at 7 points during the 100 years, would t = 1,2,3,4,... or would t = the year in which the benefits/costs arrise (e.g. t=20 years, 30, 50 etc)