问题
单项选择题
A certain Social Security recipient will receive an annual benefit of $12,000 provided he has annual earnings of $9,360 or less, but the benefit will be reduced by $1 for every $3 of annual earnings over $9,360. What amount of total annual earnings would result in a 50 percent reduction in the recipient’s annual Social Security benefit ？（）(Assume Social Security benefits are not counted as part of annual earnings.)
A．$15,360
B．$17,360
C．$18,000
D．$21,360
E．$27,360
答案
参考答案：E
解析：
设该接收者的年收入为x美元时只能获得年保障金的一半，根据题意可以得到如下方程