. 15. A open box is made of wood 3 cm thick. Its external length, breadth and height are 1.48 m, 1.16 m and 8.3 m. Find the cost of painting the inner surface at 50 per square metre.
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We have to paint an area of 5.594m2. Hence the total cost of painting the internal surface of the box will be Rs 279.70.
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