gwd 3-4

memory2006

Q4:

In the year 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 following assumptions?

 

1. 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.
2. The one percent fall in cigarette sales in the year prior to tax increase was due to a smaller tax increase.
3. The pretax price of a pack of cigarettes gradually decreased throughout the year before and the year after the tax increase.
4. 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.
5. As the after-tax price of a pack of cigarettes rises, the pretax price also rises.

why choose D. Many thanks.

flyinglamb

same question, I think it should be A

FlowerJay

算个数学题。前一年，sales降了1%；收了8cents税，sales又降了10%。 --〉sales因为税降了

如果实际价钱便宜了8分钱，也就是说即使收了8cent税，价钱不变。这样要是sales降了10%的话，显然不是8分钱税的原因。

看A，说收税以后价钱没升。如果价钱升了呢-->sales降了10%， 这个不能肯定sales下降不是税上升，而有可能是两者一起作用。

因为税的数量就是8cent，所以一旦8cent被balance了，就可以排除税起作用的可能性

auflute

第我觉得二年的pretax price亦不能涨太多，不然价格太高，收不收税都无太大分别，A有这个意思，当时就选了。。。

[此贴子已经被作者于2009-6-7 15:12:06编辑过]