The radius of a circle is so increased that its circumference

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The radius of a circle is so increased that its circumference increases by 5%. The area of the circle then increases by:

1. 12.5%
2. 10.25%
3. 10.5%
4. None of these

Correct Option: B

Increase in radius of circle = Increase in circumference of circle = 5%

∴ Increase in area =		5 + 5 +	5 × 5		% = 10.25%
			100