The cost of fencing a square field at 60 paise per metre is Rs. 1200. Find the   cost of reaping the field at the rate of 50 paise per 100 sq. metres.

Explanation

Total cost of fencing a square.
field = Rs.1200
Cost per meter = Rs.0.6
So, perimeter of the field
`= 1200/0.6 = 2000m`
Each side of square field
`= 2000/4 = 500 m`
Area of the square field
`= 500xx500= 250000 sq m`
Now, cost of repairing `= Rs.0.5`
Total cost of repairing per 100 sq m`= (250000xx0.5)/100`
`= Rs. 1250`