If the area of a square increase by 69%, then the side of the square increases by :
Options:
A . 13%
B . 30%
C . 39%
D . 69%
Answer: Option B 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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