2000 AMC 8 竞赛试题/第4题
Problem
In 1960 only 5% of the working adults in Carlin City worked at home. By 1970 the "at-home" work force had increased to 8%. In 1980 there were approximately 15% working at home, and in 1990 there were 30%. The graph that best illustrates this is:
![[asy] unitsize(18); draw((0,4)--(0,0)--(7,0)); draw((0,1)--(.2,1)); draw((0,2)--(.2,2)); draw((0,3)--(.2,3)); draw((2,0)--(2,.2)); draw((4,0)--(4,.2)); draw((6,0)--(6,.2)); for (int a = 1; a < 4; ++a) { for (int b = 1; b < 4; ++b) { draw((2*a,b-.1)--(2*a,b+.1)); draw((2*a-.1,b)--(2*a+.1,b)); } } label(](/ueditor/php/upload/image/20180330/1522395456724245.png)
Solution
The data are1960(5%),1970(8%),1980(15%)and1990(30%)Only one of these graphs has the answer and that is choice(E)
Solution 2
We can look at the graphs and note that the only one that has all the correct points is(E)
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