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The radius of a circular field is 140m and it's surrounded by a path of uniform width of 7m.find the area of the path an cost of levelling it at ₹5 per square meter. Pi= 22/7

Area of path = Pi (R^2 - r^2) = Pi(147^2-140^2) = Pi(147+140)(147-140) = (22/7) x 287 x 7 = 22 x 287 = 6314 sq m Now, cost = 5 x 6314 = 31570