Dry air at a flow rate of 0.1 kg/s is compressed from 100 kPa and 30C to 1 MPa and 350C. During the compression process, the heat loss from the compressor to the surroundings is 5kW. Assuming air to behave like an ideal gas with constant cp and Cp cy values of 1.005 kJ/kgK and 0.718 kJ/kgK, respectively, the isentropic efficiency of the compressor is (a) 76% (b) 88 % (c) 72% (d) 63 %