[讨论][求助]OG-138题

Still have a question regarding this one.

90%的人认识一个失业的 Vs. 那你认识50个，还不有2个失业

Should we do some math in order to answer this question:

if you know 50 people, two of them are unemployed --->the unemployment rate is higher than that in the case when 90% of people know some one unemployed.  Is this the correct reasoning for this question?

But I think the concept of "You know 50 people" is different from the concept of "90% of People".  Or are they the same thing?

这个还是没看明白，哪位牛牛再说说

Lawyer其实说的很清楚　我来狗尾续貂一下

这题在于了解S是反对R的态度（由S的第一句But看出）　其实就推得出 90%的人知道有失业的人并不是the alarming fact

翻译

Ｒ：警讯：这个国家90%的人说他们认识(知道)有人失业

S：但是　在正常、轻度的失业率5％下，也就是20个人中有一人失业。某人只要认识超过50各劳工，就至少有一人可能是失业的。

希望没让人更困惑

138.
Sharon’s argument is essentially that, even if the facts are as Roland presents them, they are not in and of themselves a cause for alarm. Even circumstances reassuringly normal and unremarkable-a normal, moderate unemployment rate and having 50 or more workers among one’s acquaintances-imply the sort of fact Roland
cites. Thus, that fact does not indicate that things are not normal (for example, that unemployment is alarmingly high). Choice A, therefore, is the best answer.
Sharon’s argument focuses exclusively on whether Roland’s alarm is logically warranted, given the fact he cites.Sharon herself takes no position whatsoever on what the actual facts concerning unemployment statistics and concerning people’s self-reports are. Because choices B, C, D, and E are assertions about such matters, each is incorrect.

OG的解释中黄色的部分该如何理解？郁闷了很久。