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A builder has a large plot of land and wishes to fence in 60,000 square feet...

A builder has a large plot of land and wishes to fence in 60,000 square feet of it in a rectangular shape. Because of security reasons, the fence along one side of the rectangle costs $2 per foot, whereas the fence for the other 3 sides cost $1 per foot. How many feet of each type of fence will the builder need to buy in order to minimize the cost?

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