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GWD数学有一道题，不是很懂，麻烦大家给点儿意见。谢谢！

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) %

Answer: (D)

Sorry， I got the idea. So please ignore this. I don't know how to delete！

Many thanks！

设原来为P,E,增加后为P1,E1,

则1=(1+K/100)P, E1=(1+M/100)E

问题问的是：(P1/E1 - P/E)  /  ( P/E), 用上面式子代入求得 (K - M) / (100+M), 再用百分比表示就是乘以100

关键是要细心，一步步写出条件，求值。注意 M PERCENT 的表达，GMAC常在这考。最后用PERCENT表示要乘100。