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Xiao is fencing in a 2000 square yard rectangular area around their oceanside cabin. They do...

Xiao is fencing in a 2000 square yard rectangular area around their oceanside cabin. They do not need to build a fence along the waterline. Regular fencing costs $7 per yard. Fencing that is perpendicular to the waterline requires a special material to account for changing tides, and costs $15 per yard. What dimensions should Xiao use in order to minimize the cost of the fence? Round each dimension to the nearest tenth.
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