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

A metal box with a square base and vertical sides is to contain `1024 cm^(3)`. The materical for the top and bottom costs Rs. `5//cm^(2)` and the material for the sides costs Rs. `2.50//cm^(2)`. Find the least cost of the box.

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The correct Answer is:
1920 Rs.
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