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单选题
The population of Bumpton increased by 10% from 1980 to 1990 and decreased by 10% from 1990 to 2000. What is the net percent change in the population of Bumpton from 1980 to 2000?
A
-9%
B
-1%
C
+0%
D
+1%
E
+9%
参考答案
参考解析
解析：
假设Bumpton1980的人口总数为100，因为10年后人口增加了10%，所以1990年的人口总数为(100)(1. 10) = 110。又因为1990年后10年人口减少了10%，所以2000年的总人口为110×0,9=99。所以1980到2000年人口的比例变化为(99 - 100)/100 =-1/100 = -1%。
假设Bumpton1980的人口总数为100，因为10年后人口增加了10%，所以1990年的人口总数为(100)(1. 10) = 110。又因为1990年后10年人口减少了10%，所以2000年的总人口为110×0,9=99。所以1980到2000年人口的比例变化为(99 - 100)/100 =-1/100 = -1%。
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