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A closed box (cuboid) with a square base...

A closed box (cuboid) with a square base is to have a volume 2000c.c, The material for the top and bottom of the box is to cost Rs 3 per square cm and the material for the sides is to cost Rs 1.50 per square cm. If the cost of the material is to be least find the dimension of the box.

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The correct Answer is:
`y=(2000)/(100)=20` cm
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