Steam enters the turbine at 8 MPa and 480 oC and expands to 0.7 MPa where some of the steam is extracted and diverted to the open feed water heater operating at 0.7 MPa. The remaining steam expands through the second stage turbine to the condenser pressure of 10 kPa. Saturated liquid water exists from the open feed water heater at 0.7 MPa. The isentropic efficiency of the each turbine is 85%. If the net power output of the cycle is 120 MW, determine a) the thermal efficiency and, b) the mass flow rate of steam entering the first stage of turbine