A steam power plant operates on an ideal reheat-regenerative Rankine cycle and has a net power output of 80MW. Steam enters the high-pressure turbine at 10MPa and 550C and leaves at 0.8MPa. Some steam is extracted at this pressure to heat the feedwater in an open feedwater heater. The rest of the steam is reheated to 500C and is expanded in the lowpressure turbine to the condenser pressure of 10kPa. Determine the mass flow rate of the steam through the boiler and the thermal efficiency of the cycle