Question: 21 A rectangular box is to have a square base and a volume of 81ft3. If the material for the base costs $0.65ft2, the material

21 A rectangular box is to have a square base and a volume of 81ft3. If the material for the base costs $0.65ft2, the material for the sides costs $0.15ft2, and the material for the top costs $0.25ft2, determine the dimensions (in ft ) of the box that can be constructed at minimum cost. (Refer to the figure below.)V=bwh

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