A steam power plant with closed feed water heater has a condenser temp of 45°C, a maximum pressure of 5 Mpa and boiler exit temp of 900°C.Extracted steam at 1 Mpa to the feed water heater condenses and is pumped to 5 Mpa feed water line where all the water goes to the boiler at 200°C.Find the fraction of extracted steam at specific pump work input?