An ideal gas is taken through a cyclic thermodynamic process through four steps. The amounts of heat involved in these steps ate ${\mathrm{Q}}_1=5960\mathrm{J},$${\mathrm{Q}}_2=-5585\mathrm{J},{\mathrm{Q}}_3=-2980\mathrm{J}$, ${\mathrm{Q}}_4=3645\mathrm{J}$, respectively. The corresponding works involved are ${\mathrm{W}}_1=2200\mathrm{J},{\mathrm{W}}_2=-825\mathrm{J},{\mathrm{W}}_3=-1100\mathrm{J}$ and ${\mathrm{W}}_4$, respectively. The value of W₄ is