蓝皮书31题

31. Of a certain high school graduating class, 75percent of the students continued their formal education, and 80 percent of those who continued their formal education went to four-year colleges. If 300 students in the class went to four-year colleges, how many students were in the graduating class?

A.500

B.375

C.240

D.225

E.180

我得到的答案是B，但正确的是A。

75%*80%=60%

300/0.6=500

答案没问题啊！

谢谢各位！