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A wooden bookshelf has external dimen...

A wooden bookshelf has external dimensions as follows: Height = 10 cm, Depth = 25cm, Breadth = 85 cm (See in Figure). The thickness of the plank is 5 cm 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 `c m^2` and the rate of painting is 10 paise per `c m^2` . Find the total expenses required for polishing and painting the surface of the bookshelf.

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The correct Answer is:
The total expenses of polishes and painting = Rs. 6275
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