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6#
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楼主 |
发表于 2017-2-18 02:39:25
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只看该作者
请好心人也帮我看看这道~~
og16 PS 135: In country C, the unemployment rate among construction workers dropped from 16 percent on September 1, 1992, to 9 percent on September 1, 1996. If the number of construction workers was 20 percent greater on September 1, 1996, than on September 1, 1992, what was the approximate percent change in the number of unemployed construction workers over their period?
A. 50% decrease
B. 30% decrease
C. 15% decrease
D. 30% increase
E. 55% increase
疑惑: u(nemployment)1996-u1992/ u1996 对吗? 我可以理解 u1992-u1996/u1992 是1992年到1996年unemployment 的改变。 但是相反的情况成立吗?
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