9-A chemical processing corporation is considering three methods to dispose of a non hazardous chemical sludge: land application, fluidized-bed incineration, and private disposal contract The estimates for cach method are shown Determine which has the least cost on the basis of a present worth comparison at 15% per year. (Bonus 2marks) Land Application Incineration Contract First cost. S -130.000 -95.000 -900.000 Annual operating cost $ per year 60,000 120,000 Salvage value, S Life, years 25,000 300,000 0 3 6 2