请教一下OG12样卷29题

zhangyao1946

In a survey of retailers, what percent had purchased
computers for business purposes?
(1) 85 percent of the retailers surveyed who owned
their own store had purchased computers for
business purposes.
(2) 40 percent of the retailers surveyed owned their
own store.

这么为什么选E啊，不太懂

a10285

题意理解：
（1）（2）都只提到，在为own store买的电脑中business purposes比例，
而没有提到  非own store的买的电脑中business purposes比例，
不可能得出总的business purposes的比例~~
选E

zhangyao1946

(1)的意思不是调查的人中有85%是为了business买电脑的吗？不是直接回达了问题有多少Percent的人是为了business买的吗？还是说可能会有人买电脑既是为了business又为了别的目的啊？

a10285

（1）中the retailers surveyed （who owned their own store）
括号里的表明 85%只是own store的retailer（而不是全部的retailers）
因此不能推出~~~

zhangyao1946

明白了，谢谢！解释很清楚