Two rectangular plots of length 40 m and width 20 m are as shown below.
What is the cost of fencing the plots (excluding the common boundary) at ₹ 4 per metre?
₹ 640
The rectangular plots together form a square of side 40 m.
Perimeter of the square thus formed
= 4 × side length
= 4 × 40
= 160 m
Now, cost of fencing the plots (excluding the common boundary)
= perimeter of the square × cost of fencing one metre length
= 160 × 4
= ₹ 640