From May to July, approximately what percent of the increase in t

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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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