大全-1-4

4.In M, a city of 50,000 people, MP, a realtor, caculated that a family with M's median family income, 28,000 dollars a year, could afford to buy  M's median-priced 77,000 dollars house. This caculation was based on an 11.2 percent mortgage inerest 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 correction 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 M to afford M's median-price house

A. M's total population was 45,000 people

B. M's median annual family income was 27,000

C.M's median-pirce house cost 80,000

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

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

这题为什么选C 而不选D。是不是买房只考虑贷款利率， 而不考虑收入。

I am always careless. some day it must kill me in GMAT

新问，

一直都对mortage interest rate 有疑惑。

是不是，house price*mortage rate=income*25% 这个公式正确吗？