Question 87

Each side of a square is increased by 20%. What is the percentage change in area?

Solution

Let say , side of square is a.

So, Area of Square before increase =$$a^2\ .$$

After increase of side area become =$$1.2a\times1.2a=1.44a^2.$$

So, Percentage change in area is = $$\frac{\left(1.44a^2-a^2\right)}{a^2}=0.44\ \ or\ \ 44\%\ .$$

D is correct choice.

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