A gas turbine works on an air-standard Brayton cycle with pressure ratio 6. Air enters at 1 bar and 22 °C; maximum temperature 800 °C; turbine and compressor isentropic efficiencies 90 % and 70 %. Determine the net work output (answer in kJ/kg, i.e. kW per kg/s). c_{p} = 1.005 kJ/kg·K, γ = 1.4.