[讨论]大全 Test1-4

In Millington, a city of 50,000 people, Mercedes Pedrosa, a realtor, calculated that a family with Millington’s median family income, $28,000 a year, could afford to buy Millington’s median-priced $77,000 house. This calculation was based on an 11.2 percent mortgage interest rate and on the realtor’s assumption that a family could only afford to pay up to 25 percent of its income for housing.

Which of the following corrections of a figure appearing in the passage above, if it were the only correction that needed to be made, would yield a new calculation showing that even incomes below the median family income would enable families in Millington to afford Millington’s median-priced house?

(A) Millington’s total population was 45,000 people.

(B) Millington’s median annual family income was $27,000.

(C) Millington’s median-priced house cost $80,000.

(D) The rate at which people in Millington had to pay mortgage interest was only 10 percent.（D）

(E) Families in Millington could only afford to pay up to 22 percent of their annual income for housing.

这条题目，我在做的时候，题目中所说的一堆数字全没有用到，看文章时就一带而过，在选择答案时利用基本常识就选了D：利率下降老百姓肯定开心，买房所付利息少了。

但回过头分析这道题目时，我不太懂它给出这么多数据有什么用？特别是见黄线部分，This calculation是怎样based on11.2%和25%这两个数据的推出的？

尽管费费曾说过做conclusion题目不用去管行文的逻辑推导过程，但我还是很想弄清楚这篇文章的逻辑。小妹我的数学不是很好，希望大虾在解答时能耐心教导。谢谢！