Consider a steam power plant operating on a simple ideal Rankine cycle (1-2-3-4-a-1 on the above T-s diagram). The boiler pressure is 3MPa and the condenser pressure is 70 kPa. Determine the thermal efficiency of this cycle. Repeat the problem assuming the isentropic efficiency of the turbine is 87% and the isentropic efficiency of the pump is 85%. Qualitatively explain the difference in thermal efficiency between the 2 cycles.