**Find the cost of fencing a square park of side 250 m at the rate of ₹ 20 per metre.**

To find the cost of fencing a square park with a side length of 250 meters at the rate of ₹20 per meter, you can use the formula:

Cost = Perimeter × Rate

In this case, the perimeter of the square is four times the length of one side, and the rate is ₹20 per meter.

Cost = (4 × 250 meters) × ₹20/meter

Cost = 1000 meters × ₹20/meter

Now, multiply to find the cost:

Cost = 20,000 rupees

So, the cost of fencing the square park is ₹20,000.

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