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MAA AMC
AMC 8
1993 AMC 8
21
21
Part of
1993 AMC 8
Problems
(1)
Area of new rectangle when length/width increased
Source: 1993 AMC 8 Problem 21
6/28/2011
If the length of a rectangle is increased by
20
%
20\%
20%
and its width is increased by
50
%
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\%
(A)
10%
(B)
30%
(C)
70%
(D)
80%
(E)
100%
geometry
rectangle
AMC