Difficulty: Medium
Average Score: 50%
In the past, every 10 percent increase in cigarette prices in the country of Coponia has decreased per capita sales of cigarettes by 4 percent. Coponia is about to raise taxes on cigarettes by 9 cents per pack. The average price of cigarettes in Coponia is, and has been for more than a year, 90 cents per pack. So the tax hike stands a good chance of reducing per capita sales of cigarettes by about 4 percent.

Which of the following, if true, most strengthens the argument?

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