KöMaL 2013 K364

One edge of a rectangular block of wood measures 10 cm. Three pairwise perpendicular bores, each of 2 cm by 2 cm square cross section, parallel to edges, are made through the block. (The three bores do not meet.) With the first bore made, the surface area of the block grew by 32 $cm^2$. The second bore further increased the surface area by 15.92%. The third bore was made parallel to the 10-cm edge. What was the remaining volume of the block after all three bores being made?