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Need some help with this problem A fence must be built to enclose a rectangular area of 45,000 fts. Fencing material costs $4 per foot

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A fence must be built to enclose a rectangular area of 45,000 fts. Fencing material costs $4 per foot for the two sides facing north and south and $8 per foot for the other two sides. Find the cost of the least expensive fence. The cost of the least expensive fence is $ (Simplify your answer.)

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