搞不懂的一道逻辑题

lllmmm · 发表于 2011-1-28 10:38:14

In the years following an eight-cent increase in the federal tax on a pack of cigarettes, sales of cigarettes fell ten percent. In contrast, in the year prior to the tax increase, sales had fallen one percent. The volume of cigarette sales is therefore strongly related to the after-tax price of a pack of cigarettes.
The argument above requires which of the following assumptions?

A.   During the year following the tax increase, the pretax price of a pack of cigarettes did not increase by as much as it had during the year prior to the tax increase.
B.   The one percent fall in cigarette sales in the year prior to tax increases was due to a smaller tax increase.
C.   The pretax price of a pack of cigarettes gradually decreased throughout the year before and the year after the tax increase.
D.   For the year following the tax increase, the pretax price of a pack of cigarettes was not eight or more cents lower than it had been the previous year.
E.   As the after-tax price of a pack of cigarettes rises, the pretax price also rises.
这题是神马意思啊又为什么选D？我选的A 实在不懂。。。

Sophin · 发表于 2011-1-28 12:28:52

在下不才，提供一下个人看法，首先列一个公式：after-tax price=pretax price+ tax.文章写对tax的增长和sales 下降的联系，并且与以前的sales变化比较，得出结论：sales和after-tax price 有关系，所以需要的assumption 就是要联系这两者。D的意思是在税收增加后，税前价格比以前的价格至少要低8 cents,也就是这增加的8cents确实增加了after-tax price,导致销量下降。你也可以取非D选项，如果税前价格没有比以前的少8cents,那么加上这个增加的8 cents，则未必导致最后after-tax price 的实际增加。。。楼主明白不？呵呵呵。。。

lllmmm · 发表于 2011-1-31 22:12:21

谢谢Sophin！

搞不懂的一道逻辑题

所属分类: GMAT考试

正在浏览此版块的会员 ()