2010 AMC 8 Problem 3

Attempt Problem 3 of the 2010 AMC 8 below, then check your answer against the professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2010 AMC 8 solutions, or check the answer key.

All problems are used with official legal permission of the Mathematical Association of America (MAA).

3.

The graph shows the price of five gallons of gasoline during the first ten months of the year. By what percent is the highest price more than the lowest price?
 50 \ 50
 62 \ 62
 70 \ 70
 89 \ 89
 100 \ 100
Answer: C
Concepts:data and graph interpretationpercentage
Small hint:
Percent more means the increase divided by the lowest price.
Big hint:
Read the highest and lowest bar heights from the graph.
Solution:
The highest price is 1717 and the lowest price is 10.10. This means the percent is (1710−1)⋅100=70. (\dfrac{17}{10}-1)\cdot 100 = 70.
Thus, the answer is C .
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