请教GWD

Last year the price per share of Stock X increased by k percent and the earnings per share of Stock X increased by m percent, where k is greater than m.  By what percent did the ratio of price per share to earnings per share increase, in terms of k and m?

A.     k/m %

B.     (k-m) %

C.     [100(k-m)]/(100+k) %

D.     [100(k-m)]/(100+m) %

E.      [100(k-m)]/(100+k+m) %

如何求借呀

这道题目是这样的：题目问what percent did the ratio of price per share to earnings per share increase, in terms of k and m，就是问，每股价格比每股收益的比率增加了百分之多少？
 

过程是：