If a large pizza has a radius that is 20% larger that that of a medium pizza, what is the percent increase in area between a medium and a large pizza? Choose the correct choice
A) 20%
B) 36%
C) 44%
D) 50%
E) 64%
Let the radius of medium pizza be r. Then the radius of large pizza is 1.2r.   The area of the medium pizza is pi*r^2   The area of the large pizza is pi*(1.2*r)^2 = 1.44*pi*r^2, an increase of 44%.   The answer is 44%.
<result>C</result>
If a large pizza has a radius that is 20% larger that that of a medium pizza, what is the percent increase in area between a medium and a large pizza?