问题
单项选择题
On a certain road, 10 percent of the motorists exceed the posted speed limit and receive speeding tickets, but 20 percent of the motorists who exceed the posted speed limit do not receive speeding tickets. What percent of the motorists on that road exceed the posted speed limit ？（）
A.A
B.B
C.C
D.D
E.E
答案
参考答案：B
解析：
根据题意可知在超速的汽车司机中接到超速罚单的人占80%，所以超速者所占总司机人数的百分比为
。