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If radius of a circle is increased by 5%, then the increase in it's area is :
Answer & Solution
Correct Answer:
Option
A
Quicker approach
$$ \uparrow $$ in A = a + b + $$\frac{ab}{100}$$
Here a = b = 5%
$$ \uparrow $$ in A :
$$\eqalign{ & = \left( {5 + 5 + \frac{{5 \times 5}}{{100}}} \right)\% \cr & = 10.25\% \cr} $$
$$ \uparrow $$ in A = a + b + $$\frac{ab}{100}$$
Here a = b = 5%
$$ \uparrow $$ in A :
$$\eqalign{ & = \left( {5 + 5 + \frac{{5 \times 5}}{{100}}} \right)\% \cr & = 10.25\% \cr} $$
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