GWD 里面的一道数学题,各位大虾能帮忙解释一下为什么选D? 万分感谢

linmeimei

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) %

jli3

=(1+k%)/(1+m%)-1
=(100+k)/(100+m)-(100+m)/(100+m)
=(k-m)/(100+m)
=[100(k-m)]/(100+m)%

linmeimei

不太明白k和m的区别,请指教