求解prep数学题！！！

babyou

In 1990 company X's gross profit was what percent of its revenue?
(1)In 1999 company X's profit was 1/3 of its expense
(2)In 1999 conpany X's expense  were 3/4 of its revenue

为什么选D呢？不该选C么？求指导！！！

xmlvivian

选D没错。
revenue-expense=profit
题求：profit/ revenue=?  
A. profit=1/3expense 带入式子可求出
B.expense=3/4revenue  带入式子 也可求出

babyou

啊~这样~谢谢！！！！