Your company intends to operate its highly polluting coal-fired power plant located in Alberta for 4 more years before demolishing it (i.e., the Project life is 4 years). The steam turbines of the plant are defective and they have to be either overhauled (repaired) at a cost of SY/turbine or replaced. The life of a turbine after an overhaul is 2 years (and after two years it has to be overhauled again in order to keep it in operation). The cost of a new turbine is $X and its expected life is 5 years. MARR (the minimum attractive rate of return) is 10 % Salvage values are zero. The O/M (operating and maintenance) costs of the new and overhauled turbines are given below: 4 End of year Overhauled turbine, S/year New turbine, S/year 20,000 420,000 140,000 140,000 40,000 140,000