天山第4套的33题

lemonees

这道题目好象在哪套模考出现过，可就是找不着了

Q33:
Of the families in City X in 1994, 40 percent owned a personal computer. The number of
families in City X owning a computer in 1998 was 30 percent greater than it was in 1994,
and the total number of families in City X was 4 percent greater in 1998 than it was in
1994. What percent of the families in City X owned a personal computer in 1998 ?
A. 50%
B. 52%
C. 56%
D. 70%
E. 74%

偶的列式：令98年的家庭人数为A

A*（1+4%）*40%*（1+30%）/A=0.5408

答案居然选A，而我算出来的却找不到，郁闷呀~~~~咳，不知道大脑哪根神经出了问题，真是考前综合症！

himba

94年有100户居民，一共40户有电脑，

到了98年，电脑用户增长30%，所以有52户人家拥有电脑，

但是人口增长了4％，所以98年的时候有104户居民，

这个时候电脑占有率就是52/104=50%，

选a

lemonees

谢谢版主！！！