In a thermal power plant operating on a regenerative Rankine cycle superheated steam at 50 bar and 500C enters a turbine. A suitable fraction of the steam is withdrawn from the turbine at 10 bar and the rest of the steam expands to the condenser pressure 0.05 bar. Calculate the thermal efficiency of the steam power plant and the mass flow rate of steam if the net power output of the plant is 100 MW.