In a simple Brayton cycle, the pressure ratio is 8 and temperatures at the entrance of compressor and
turbine are 300 K and 1400 K, respectively. Both compressor and gas turbine have isentropic efficiencies
equal to 0.8. For the gas, assume a constant value of cp (specific heat at constant pressure) equal to 1 kJ/kgK
and ratio of specific heats as 1.4. Neglect changes in kinetic and potential energies. The thermal efficiency of the cycle in percentage (%) is