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  3. PERCENT OF THE 300 PEOPLE IN GROUP 1 AND THE 400 PEOPLE IN GROUP 2 WHO HAVE SELECTED AILMENTS The number of pe

PERCENT OF THE 300 PEOPLE IN GROUP 1 AND THE 400 PEOPLE IN GROUP 2 WHO HAVE SELECTED AILMENTS The number of pe

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问题          PERCENT OF THE 300 PEOPLE IN GROUP 1 AND THE 400 PEOPLE
               IN GROUP 2 WHO HAVE SELECTED AILMENTS

The number of people in group 2 who have hay fever is how much greater than the number of people in group 1 who have hay fever?
选项 A、37
B、35
C、32
D、28
E、24
答案D
解析 In group 1, there are 300 people, 4% of whom have hay fever. Therefore, in group 1, there are(0.04)(300)people, or 12 people, who have hay fever. In group 2, there are 400 people, 10% of whom have hay fever. Therefore, in group 2, there are(0.10)(400)people, or 40 people, who have hay fever. Since 40 - 12 = 28, it follows that there are 28 more people in group 2 who have hay fever than there are in group 1. The correct answer is Choice D.
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