大全-4-17 [求助]

nos36

思路是否正确,请牛牛指点
15. One state adds a 7 percent sales tax to the price of most products purchased within its jurisdiction. This tax, therefore, if viewed as tax on income, has the reverse effect of the federal income tax: the lower the income, the higher the annual percentage rate at which the income is taxed.
The conclusion above would be properly drawn if which of the following were assumed as a premise?
(A) The amount of money citizens spend on products subject to the state tax tends to be equal across income levels.
(B) The federal income tax favors citizens with high incomes, whereas the state sales tax favors citizens with low incomes.
(C) Citizens with low annual incomes can afford to pay a relatively higher percentage of their incomes in state sales tax, since their federal income tax is relatively low.
(D) The lower a state's sales tax, the more it will tend to redistribute income from the more affluent citizens to the rest of society.
(E) Citizens who fail to earn federally taxable income are also exempt from the state sales tax.

Ans is A
Assume as a premise : 假设前题 : 取非->结论不存在
结论: This tax, therefore, if viewed as tax on income, has the reverse effect of the federal income tax: the lower the income, the higher the annual percentage rate at which the income is taxed.
Sales tax 与federal income tax有相反的结果; federal income tax->低收入->高比率的收入被客税
A:花的钱一样多在所有income level -> 如果不同(有钱花的比没钱多,那就都是高比率),结论不成立
思路是否正确,请牛牛指点

云淡风轻

这是一道数学逻辑题，我是这样想的：
把percentage rate at which the income is taxed转换成数学公式就是：
7%purchasing amounts / income
结论是the lower the income, the higher the annual percentage rate at which the income is taxed，即要衡量上式结果随income变化的情况，则需要假设其他参数为常数，即purchasing amounts都一样。答案A就是这个意思。

15. One state adds a 7 percent sales tax to the price of most products purchased within its jurisdiction. This tax, therefore, if viewed as tax on income, has the reverse effect of the federal income tax: the lower the income, the higher the annual percentage rate at which the income is taxed.
The conclusion above would be properly drawn if which of the following were assumed as a premise?
(A) The amount of money citizens spend on products subject to the state tax tends to be equal across income levels.

nos36

感谢云淡风轻!!一针见血!!

言子心

请教分子为什么是7%*purchasing amount呢？income tax=sales tax吗？？