【求助】GWD一道数学题

GWD -03-18

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) %

哪位NN帮我解释下，为什么答案选择D? 还有问题的最后一句话“the ratio of price per share to earnings per share increase”，应该怎么翻译？

感激不尽！

是选D么？

应该就是p/e的增长率吧

（1+k%）/(1+m%)-1=(k-m)/100+m