In the past, every ten-percentage-point increase in cigarette prices in the country of Coponia has decreased per capita sales of cigarettes by four percent. Coponia is about to raise taxes on cigarettes by 9 cents per pack. The average price of cigarettes in Coponia is and has been for more than a year 90 cents per pack. So the tax hike stands an excellent chance of reducing per capita sales of cigarettes by four percent.

E谈的人口总数跟人均消费数量无关，大家口袋里的钱跟多少一起抽烟没关系

We have know a condition that when ten-percentage-point increase in cigarette price,sales of cigarettes by four percent

Now,we know that per capita sales of cigarettes by four percent.What does it mean?That means ten-percentage-point increase in cigarette price has occurred.And we know that last year the price is 90cents.And know 9 cents tax have been raised.What's the relationship between 9 and 90?That's 10% increase.So what we would know? That is manufacturer did nothing but put the extra tax ,9 cents, onto 90 cents directly,which is the price in last year.So A is the correct answer.

以下是引用bjshhbyl在2006-12-14 8:00:00的发言：

1. GWD-29-Q38

Which of the following is an assumption on which the argument depends?

Tobacco companies are unlikely to reduce their profit per pack of cigarettes to avoid an increase in the cost per pack to consumers in Coponia.
Previous increases in cigarette prices in Coponia have generally been due to increases in taxes on cigarettes.
Any decrease in per capita sales of cigarettes in Coponia will result mainly from an increase in the number of people who quit smoking entirely.
At present, the price of a pack of cigarettes in Coponia includes taxes that amount to less than ten percent of the total selling price.
The number of people in Coponia who smoke cigarettes has remained relatively constant for the past several years.

这题的答案有两个：A和E，我倾向于A，大家讨论下。

明显选A啊，政府的算盘是，加税后价格上涨，所以就会下降人均吸烟数量。前提是烟草公司也不愿意减少他们的每包利润来，以冲减增加的税款来保持原有的价格，这样才有可能一定会涨价，才有后面的降低人均销量。因为如果烟草公司选择减少利润而冲销了增加的税款，就可以维持价格不变，所以就没有后面的推论了。

这类带数学的CR不少.一般是3个变量,一个变化会导致另一个变化的关系成立,assumption就是第三个量不变。

比如这道，P税前+税=P税后，税变导致P税后变前提是P税前不能变。

还碰到过非法捕鱼的。说合法捕鱼减少了的数量，都是非法捕鱼捕去了成立。暗含了等式

非法捕鱼数量+合法捕鱼数量=河里鱼总数。此消彼长的关系成立就是要保证总数不变。

A 烟草公司不会减少利润来降低消费者的花销，意思就是烟草公司不会降价来抵消加的税，这样加税才能起到提价的作用，才能由于价格升高而引起销量减少

ChaseDream

1. GWD-29-Q38

1. GWD-29-Q38