Question: A box, with rectangular sides, base and top is to have a volume of 4 cubic feet. It has a square base. If the material

A box, with rectangular sides, base and top is to have a volume of 4 cubic feet. It has a square base. If the material for the base and top costs 10 dollars per square foot and that for the sides costs 20 dollars per square foot, what is the least cost it can be made for?$

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