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1. If the length of a rectangle is increased by 40% and the width is decreased by 20%, the area of the rectangle will increase by?
- A. 20%
- B. 20%
- C. 20%
- D. 20%
Answer: Option B
Explanation:
Let the initial length and width be L & W respectively.
Then, initial area = L x W
Length after 40% increament = 1.4L
Width after 20% decreament = 0.8W
New area = 1.4L x 0.8W = 1.12 (L x W)
So, area will increase by 12%.
[Shortcut: ( + 40) + ( - 20) + ( + 40)x( - 20)/100 = + 12%]
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