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题目材料:

Based on the trend line, which of the following is closest to the average annual rate at which the inflation-adjusted minimum wage increased from October 1990 to October 1999?
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A.$0.15 per year
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B.$0.12 per year
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C.$0.09 per year
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D.$0.06 per year
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E.$0.03 per year
E显示答案