You can assume there is no pressure drop between the exit of the compressor and the entrance of the turbine. All the power from the turbine runs the compressor. The turbine exit conditions are 780 K, 300 kPa. All components operate at the steady state, you can ignore kinetic and potential energy, as well as heat transfer, which is small compared to the power generated by the turbine. How much work is generated by the turbine?