A gas turbine power plant operates on a simple Brayton cycle with air (use the PG model)

Question:

A gas turbine power plant operates on a simple Brayton cycle with air (use the PG model) as the working fluid. The air enters the turbine at 1 MPa and 1000 K and leaves at 125 kPa, 610 K. Heat is rejected to the surroundings at a rate of 8000 kW and air flow rate is 25 kg/s. Assuming a compressor efficiency of 80%, determine
The net power output. Use the PG model for air.