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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?


  1. ₹ 16000

  2. ₹ 1600

  3. ₹ 640

  4. ₹ 6400


Solution

The correct option is C

₹ 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

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