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From May to July, approximately what percent of the increase in the total number of readers of Magazine X was the increase in the number of readers in the 31^40 age group?
答案:D

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老师这题我算出来是42%,请问怎么算出来是D的?
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请问这题不是(26000x24.2%-22000x21.2%)/(26000-22000)=42%吗?

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