A 5-mm-by-50-mm-by-300-mm steel bar has two round steel disks, each 50 mm in diameter and 20 mm long, welded to one end. A small hole is drilled 25 mm from the other end. Using 7.80 Mg/m3 for the density of steel, find the mass moment of inertia of the bar about an axis through the hole.

Figure P12.2 Dimensions in millimeters.