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PV diagram to solve toal work and heat transfer

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A confined quantity of air undergoes two thermodynamic processes departing from an initial equilibrium state where the temperature is 20°C, the absolute pressure is 1bar, and the volume is 0.2m3. First, the volume of the system is doubled through an isobaric process. Then, the volume is reduced back to the initial value through a process where the relation P?V1.4 is maintained constant. You may assume average values for the specific heat capacities (cp and cv) to:
(a) Sketch the processes in a P-V diagram.
(b) Determine the temperature of the three states in K.
(c) Compute the total work in kJ.
(d) Compute the total heat transfer in kJ.

See the attached file.

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The solutions provides a complete process how P-V diagram is used to solve the total work and heat transfer.

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