0.2 moles of an ideal gas is taken round the cycle ABC as shown in the figure. The path B → C is an adiabatic process, A → B is an isochoric process and C → A is an isobaric process. The temperature at A and B are TA = 300 K and TB = 500 K and pressure at A is 1 atm and volume at A is 4.9 L. The volume at C is