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A metal box with a square base and ve...

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

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The correct Answer is:
`"Rs. "15(1024)^(2//3)`
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