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Area of new rectangle when length/width increased

Source: 1993 AMC 8 Problem 21

June 28, 2011
geometryrectangleAMC

Problem Statement

If the length of a rectangle is increased by 20%20\% and its width is increased by 50%50\% , then the area is increased by
(A) 10%(B) 30%(C) 70%(D) 80%(E) 100%\text{(A)}\ 10\% \qquad \text{(B)}\ 30\% \qquad \text{(C)}\ 70\% \qquad \text{(D)}\ 80\% \qquad \text{(E)}\ 100\%
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