If the area of a square increase by 69 then the...

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If the area of a square increase by 69%, then the side of the square increases by :

A. 13%

B. 30%

C. 39%

D. 69%

Answer: Option B

Solution(By Examveda Team)

Le original area = 100 cm²
Then, new area = 169 cm²
⇒ Original side = 10 cm
New side = 13 cm
Increase on 10 cm = 3 cm
Increase % :
$$\eqalign{ & = \left( {\frac{3}{{10}} \times 100} \right)\% \cr & = 30\% \cr} $$

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