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A metal box with a square base and vertical sides is to contain 1024 cm^3. The material for the top and bottom costs Rs 5 per

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A metal box with a square base and vertical sides is to contain 1024 cm3. The material for the top and bottom costs Rs 5 per cm2 and the material for the sides costs Rs 2.50/cm2. Find the least cost of the box. 

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Let side of square base of box be x cm and its height be h cm. Volume of the box = 1024 cm3

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