Q.13 Find the cost of fencing a square park of side 250 m at the rate of Rs 20 per metre.

Side of square = 250 m
Perimeter of square = 4 × side
= 4 × 250
= 1000 m
Cost of fencing = Rs 20 per m
Cost of fencing for 1000 m = Rs 20 × 1000
= Rs 20,000