2012 AMC 8 第 2 题
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所有题目均经美国数学协会（MAA）官方合法授权使用。
2.
在 East Westmore 县，统计学家估计每 小时出生一个婴儿，每天死亡一人。四舍五入到最接近的百位，East Westmore 每年人口增加多少人？
In the county of East Westmore, statisticians estimate there is a baby born every hours and a death every day. To the nearest hundred, how many people are added to the population of East Westmore each year?
小提示：
先求一天内人口的净变化。
Find the net population change in one day.
大提示：
每 小时出生一个婴儿，表示每天出生 个婴儿。
A birth every hours means births per day.
视频讲解：
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文字解答：
每 小时出生 个婴儿，所以每 小时出生 个婴儿。因此每天有 人出生、 人死亡，平均每天人口净增加 人。一年有 天，每天净增加 人，所以一年净增加约 人，约为 。
所以正确答案是 B。
Since we have birth every hours, we have births every hours. Therefore, we have births a day and death a day. The net change in population every day should be on average Since we have days in a year and added to the population every day, the net change in population should be around This is approximately
Thus, the answer is B .
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