a wooden bookself has external dimensions on follows heights-110, depth 25cm , breadth 85cm. The thickness of the plank is 5cm everywhere. The external face are to be painted. If the rate of polishing is 20paise per cm square and the rate of painting is 10paise per cm square, find the total expenses required for polishing and painting the surface of the book self.
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hey frnd its answer is 40 .....
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