Algebra
posted by Zach .
The radius of a circle is increased by 85%. How much will the area increase in percent? Round your answer to the nearest tenth if a percent.
I'm stuck on this question. Thanks
Zach

Algebra 
Reiny
original area = pi(1^2) = pi
new area = pi(1.85^2) = 3.4225pi
increase = 3.4225pi  pi = 2.4225pi
percentage increase = 2.4225pi/pi = 2.4225
= 242.3 %
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