Pleas final answer

5- A perfect gas with (y -1.4) undergoes an expansion process from an initial pressure of 600 kPa. The ratio of specific volumes V/V, is 3.0. The pressure Pa (in kPa) at the end of the process if this is polytropic process with an index n of 1.6 is: a) 103 b) 200 0) 261 d) 135 e) 300 6- In the previous question (5), what will be the pressure in an isothermal process: B) 200 b) 103 C) 261 ) 135 c) 300