Thermodynamics?

Consider a cogeneration power plant modified with regeneration. Steam enters the turbine at 7 MPa, 440oC at a rate of 20 kg/s and expands to a pressure of 0.4 MPa. At this pressure 60% of the steam is extracted from the turbine, and the remainder expands to 10 kPa. Part of the extracted steam is used to heat the feedwater in an open feedwater heater. The rest of the extracted steam is used for process heating and leaves the process heater as a saturated liquid at 0.4 MPa. It is subsequently mixed with the feedwater leaving the feedwater heater, and the mixture is pumped to the boiler pressure. uming the turbines and the pumps to be isentropic, determine (a) the total power output of the turbine, (b) the m flow rate of the steam through the process heater, (c) the rate of heat supply from the process heater per unit m of steam ping through it, and (d) the rate of transfer to the steam boiler ?