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Sandy will make a closed rectangular jewellery box with a square base from two different woods. The wood from the top and bottom costs $0.0040/cm squared. The wood for the sides costs $0.0060/cm squared. Find the dimensions that minimize the cost for a box with volume 8000 cm cubed. Round your final answers to the nearest tenth.A carpenter builds an open box with a square base. She has 15 m squared of wood available. Find the volume of the largest box she can build. Round your final answers to the nearest tenth