A wooden bookshelf has external dimensions as follows: Height = 110 cm, Depth = 25 cm,
Breadth = 85 cm (see fig. 13.31). The thickness of the plank is 5cm everywhere. The external faces
are to be polished and the inner faces are to be painted. If the rate of polishing is 20 paise per cm2
and the rate of painting is 10 paise per cm2, find the total expenses required for polishing and
painting the surface of the bookshelf.
