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You need to build a rectangular enclosure divided into 3 equal rectangular sections, occupying a total...

You need to build a rectangular enclosure divided into 3 equal rectangular sections, occupying a total area of 200 square feet. The exterior fencing needs to be reinforced, and so costs $10 per linear foot, while the interior fencing only costs $2.50 per linear foot. Find the dimensions of the enclosure which five the minimum cost. be sure to justify that your solution is correct.

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