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An ice cube in the form of a rectangular prism with a square base is melting so that the edge of the base is

An ice "cube" in the form of a rectangular prism with a square base is melting so that the edge of the base is shrinking at 0.4mm/min while the height is decreasing at 0.16mm/min. Determine the rate of change of its surface area when the edge of the base is 50mm and the height is 20mm.

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