天山-9-18

小I爱漂漂

9-18 PS

Last year the price per share of stock x increased by k% and the earnings per share of stock x increased by m%, where k>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+m+k)%

答案选D,不知道怎么做，可能不太理解最后一句话的意思????

我的做法是: 设前年的price=p, 前年的earnings=e. 那去年的price=p(1+k%), 去年的earnings=e(1+m%),

然后就是用两个ratio之差就是增加的percent,

p(1+k%)/e(1+m%)-p/e,

为什么不对呢???请帮帮忙，谢谢先!!

爱维的天

以下是引用小I爱漂漂在2005-2-7 18:33:00的发言：

9-18 PS
Last year the price per share of stock x increased by k% and the earnings per share of stock x increased by m%, where k>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+m+k)%
答案选D,不知道怎么做，可能不太理解最后一句话的意思????
我的做法是: 设前年的price=p, 前年的earnings=e. 那去年的price=p(1+k%), 去年的earnings=e(1+m%),
然后就是用两个ratio之差就是增加的percent,
p(1+k%)/e(1+m%)-p/e,
为什么不对呢???请帮帮忙，谢谢先!!

參考....http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=45613