Question: A fence must be built to enclose a rectangular area of 45,000 ft^2. Fencing material costs $3 per foot for the two sides facing north

A fence must be built to enclose a rectangular area of 45,000 ft^2. Fencing material costs $3 per foot for the two sides facing north and south and $6 per foot for the other two sides. Find the cost of the least expensive fence.

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