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A rectangular box is to have a square base and a volume of 20 ft3. The material for the base costs 39/ft2, the material for the sides costs 10/ft2,...

A rectangular box is to have a square base and a volume of 20 ft3. The material for the base costs 39¢/ft2, the material for the sides costs 10¢/ft2, and the material for the top costs 22¢/ft2. Letting x denote the length of one side of the base, find a function in the variable x giving the cost (in dollars) of constructing the box.

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