Consider an ideal combined cycle with compression ratio of 7:1 in which air enters the compressor at 295 K, enters the turbine at 1200 K, and exits the heat exchanger at 400 K. In the steam cycle, steam in compressed to 8 MPa, heated to 400 °C in the heat exchanger, and then condensed at a pressure of 10kPa. Calculate the theoretical efficiency of this cycle, and compare to the differences of the two cycles separately.