In Millington,a city of 50,000 people,Mercedes Pedrosa,a realtor,calculated that a family with

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.
(E) Families in Millington could only afford to pay up to 22 percent of their annual income for
housing.
是选D,但是为什么?