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.
- EAs the after-tax price of a pack of cigarettes rises, the pretax price also rises
有一个疑问 关于a选项 这个题只要证明 升税前一年的 税后价格低于升税后一年的税后价格即可
税后价 = 税前价 + 税
a说升税后一年的税后价 比前一年的涨幅小 说明他还在涨 没有跌 而升税后税的价格自然也高于升税前税的价格 所以 这年的税后价比前年的高
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发表于 2013-11-5 22:57:39
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