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You are building a glass fish tank that will hold 72 cubic feet of water. You want its base and sides to be rectangular and the top, of course, to be open. You want to construct the tank so that its width is 5 ft but the length and depth are variable. Building materials for the tank cost $10 per square foot for the base and $5 per square foot for the sides. What is the cost of the least expensive tank?

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