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4. A closed rectangular box, where the base is twice as long as it is wide, must be able to hold 200 m3. The material

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4. A closed rectangular box, where the base is twice as long as it is wide, must be able to hold 200 m3. The material for the base and top costs $5/m?, the material for the four sides costs $3/m2. Determine the lowest possible cost for the box. [ 3 marks ]

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