Air enters a turbine operating at steady state at 500 kPa, 860 K and exits at 100 kPa. A temperature is 460 K. Stray heat transfer and kinetic and potential energy effects are negligible. A hard-to-read photocopy of the data sheet indicates that the pressure of the exiting stream is either 1.0 MPa or 1.8 MPa. Assuming the ideal gas model of air with Cp=1.02 kJ/kg * K, determine if either or both of these pressure values can be correct.