Question

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?

• A. ₹ 16000
• B. ₹ 1600
• C. ₹ 640
• D. ₹ 6400

Answer 1

The correct option is C

₹ 640

The rectangular plots together form a square of side 40 m.

Perimeter of the square thus formed
= 4 $\times$ side length
= 4 $\times$ 40
= 160 m

Now, cost of fencing the plots (excluding the common boundary)
= perimeter of the square $\times$ cost of fencing one metre length
= 160 $\times$ 4
= ₹ 640