$18\mathrm{.}43$

A gas sample undergoes the cyclic process ABCA shown in the figure, where $\backslash ($ A B $\backslash )$ lies on an isotherm. The pressure at A is $52$ kPa $.$ Find the net work $($J$)$ done on the gas. $($The answer is positive since we define the work is positive if the environment does $+$work to the system.$)$