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看了好久了,写一点自己的理解
after-tax price=pre-tax price+tax
price 变高--sales 下降
Tax(8 cent)--?-- after-tax price上升----sales下降
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.(要确定的仅仅是现在的after-tax价格,和以前的价格的高低对比,这个上升的幅度不能够和8cent一起去量化)
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.(总价格没有涨,说明不成立)
E. As the after-tax price of a pack of cigarettes rises, the pretax price also rises.
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