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Radius of the park = (140/2) = 70 metres
Perimeter of the fence = 2 X π X radius = 2 X (22/7) X 70 = 440 metres
So, area to be fenced = 440 X 12 = 5,280 m 2
So, required cost = 5,280 X 2.5 = Rs. 13,200
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