A monatomic ideal gas at $27\mathrm{.}0$C undergoes a constant volume process from$$A$$to$$B$$and a constant$-$pressure process from$$B$$to$$C$.$ where$$P$1=2\mathrm{.}70,$P$2=5\mathrm{.}40,$V$1=2\mathrm{.}70,$ and$$V$2=5\mathrm{.}40.$ Find the total work done on the gas during these two processes.