A radius of a circle is increased by 20%. By what percentage does its area increase?

Topic: Percentages
Subtopic: Area Changes

A40%

B42%

C44%

D48%

Explanation

Area is proportional to r^2. Percentage change = 20 + 20 + (20 * 20)/100 = 40 + 4 = 44%.

Exam Relevance

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