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a rectangular area of 3200 square feet is to be fenced off. Two opposite sides will use fencing costing $3 per foot and the remaining sides will use...

a rectangular area of 3200 square feet is to be fenced off. Two opposite sides will use fencing costing $3 per foot and the remaining sides will use fencing costing $4.50 per foot. Find the dimensions of the rectangle of least cost

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