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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