Difference between revisions of "University of South Carolina High School Math Contest/1993 Exam/Problem 6"
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== Solution == | == Solution == | ||
+ | Let <math>p=10</math>. Thus if <math>100</math> dollars was the original price, after the price reduction, we have <math>90</math> dollars. We need <math>10</math> dollars. Thus, <math>90(1+x)=100 \Longrightarrow x=\frac{10}{90}</math>. The percentage thus is choice <math>(e)</math>. | ||
== See also == | == See also == | ||
* [[University of South Carolina High School Math Contest/1993 Exam]] | * [[University of South Carolina High School Math Contest/1993 Exam]] |
Revision as of 22:42, 21 July 2006
Problem
After a $p%$ (Error compiling LaTeX. Unknown error_msg) price reduction, what increase does it take to restore the original price?
Solution
Let . Thus if dollars was the original price, after the price reduction, we have dollars. We need dollars. Thus, . The percentage thus is choice .