The operating cost for a proposed waste-water treatment plant is estimated as $500,000 per year, increasing by $100,000 each year after the first. Assume i = 6 percent. Find the following: a) Equivalent annual cost of all operating costs, for a life of 25 years. b) Present worth of all operating costs, for a life of 25 years. c) Equivalent annual cost of all operating costs, for a perpetual life. d) Present worth of all operating costs, for a perpetual life