A geothermal power plant utilizes steam produced by natural means underground. Steam wells arc drilled to tap this steam supply which is available at 4.5 bar and 175 degree C. The steam leaves the turbine at 100 mm Hg absolute pressure. The turbine isentropic efficiency is 0.75. Calculate the efficiency of the plant. If the unit produces 12.5 MW, what is the steam flow rate?