The benefits arising from the construction of a dam to provide irrigation water are estimated as follows: in the first five years after completion $100000 per year; in the next five years $200000 per year; in the next fifteen years $300000 per year; in the next 50 years $400000 per year. 1What is the present worth of these benefits at completion date if the interest rate is 5% per annum? What is the equivalent uniform annual benefit over this life of 75 years at the same interest rate