问题
单项选择题
Diana bought a stereo for $530, which was the retail price plus a 6 percent sales tax. How much money could she have saved if she had bought the stereo at the same retail price in a neighboring state where she would have paid a sales tax of 5 percent ？（）
A．$1.00
B．$2.65
C．$4.30
D．$5.00
E．$5.30
答案
参考答案：D
解析：
设该音响的零售价为x，则由题意可得：
[*]
因此Diana可节省的钱为$5.00。