If the radius of a circle is increased by 50%, its area

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If the radius of a circle is increased by 50%, its area is increased by :

1. 125%
2. 100%
3. 75%
4. 50%

Correct Option: A

Using Rule 12,
If the radius of circle is increased by x%, the area changes by

=		2x +	x²		%
			100

=		2 × 50 +	50 × 50		% = 125%
			100