Three forces having magnitudes 5,4 and 3 units act on a particle in the directions $2\overline{\mathrm{i}}-2\overline{\mathrm{j}}-\overline{\mathrm{k}} , \overline{\mathrm{i}} + 2\overline{\mathrm{j}} + 2\overline{\mathrm{k}}$ and $-2\overline{\mathrm{i}} + \overline{\mathrm{j}}-2\overline{\mathrm{k}}$ respectively and the particle gets displaced from the point A whose position vector is $9 \overline{\mathrm{i}} + 7\overline{\mathrm{j}} + 5\overline{\mathrm{k}}$ then the work done by these forces is