Difference between revisions of "2009 AMC 8 Problems/Problem 8"
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\textbf{(D)}\ 101 \qquad | \textbf{(D)}\ 101 \qquad | ||
\textbf{(E)}\ 110</math> | \textbf{(E)}\ 110</math> | ||
| + | |||
| + | ==Solution== | ||
| + | In a rectangle with dimensions <math>10 \times 10</math>, the new rectangle would have dimensions <math>11 \times 9</math>. The ratio of the old area to the new area is <math>99/100 = \boxed{\textbf{(B)}\ 99}</math>. | ||
==See Also== | ==See Also== | ||
{{AMC8 box|year=2009|num-b=7|num-a=9}} | {{AMC8 box|year=2009|num-b=7|num-a=9}} | ||
Revision as of 16:30, 25 December 2012
Problem
The length of a rectangle is increased by $10%$ (Error compiling LaTeX. Unknown error_msg) and the width is decreased by $10%$ (Error compiling LaTeX. Unknown error_msg). What percent of the old area is the new area?
Solution
In a rectangle with dimensions 
, the new rectangle would have dimensions 
. The ratio of the old area to the new area is 
.
See Also
| 2009 AMC 8 (Problems • Answer Key • Resources) | ||
| Preceded by Problem 7 |
Followed by Problem 9 | |
| 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 | ||
| All AJHSME/AMC 8 Problems and Solutions | ||
