Work done is given by area enclosed in the $\mathrm{P} \mathrm{vs} \mathrm{V}$ cyclic graph or $\mathrm{V} \mathrm{vs} \mathrm{P}$ cyclic graph

 Sign of work is positive for clockwise cyclic process for $\mathrm{V} \mathrm{vs} \mathrm{P}$ graph.

Work done in cyclic process = area inside the figure

$$\begin{gathered} \mathrm{W}=\frac{1}{2}\times (30-10)\times (30-10) \\ =200 \mathrm{kPa}-{\mathrm{dm}}^3 \end{gathered}$$

$$\begin{gathered} =200\times 1000 \mathrm{Pa}-\mathrm{L} \\ =2 \mathrm{L}-\mathrm{bar} \\ =200 \mathrm{J} \end{gathered}$$