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Cost of fencing around a square field is Rs. 12000. If the cost of fencing per metre is Rs. 30, find the area of the square field.

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Cost of fencing per metre = Rs 30 

Total cost of fencing = Rs 12000 

So, the length of fencing (perimeter) = Total cost/ Cost per metre 

= 1200/30

= 400 m 

Now, length of fencing = Perimeter of the square field 

 = 4 × side of the field 

Therefore, 4 × side of the field = 400 m 

or, side of the field = 400/4 m = 100 m 

So, area of the field = 100 m × 100 m = 10000 sq m. 

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