Figure 1 shows an ideal regenerative Rankine cycle with one open feed-water heater. Part of the steam is bled from the turbine at 0.7 MPa (state 2) and mixed with the feed water (state 5) in the heater, which delivers saturated liquid (state 6). The enthalpies of all states are given in the table on the figure. Per kg of steam leaving the boiler, determine (a) the mass fraction of steam bled to the heater (answer as a fraction), (b) the net work output of the cycle (in kJ/kg) and (c) the thermal efficiency of the cycle (in %).