2007 AMC 8 Problems/Problem 6
Problem
The average cost of a long-distance call in the USA in was cents per minute, and the average cost of a long-distance call in the USA in was cents per minute. Find the approximate percent decrease in the cost per minute of a long- distance call.
Solution
The percent decrease is (the amount of decrease)/(original amount)
the amount of decrease is
so the percent decrease is which is about
See Also
2007 AMC 8 (Problems • Answer Key • Resources) | ||
Preceded by Problem 5 |
Followed by Problem 7 | |
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