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标题: 求解一道GWD数学题 [打印本页]

作者: jaffa23 时间: 2011-2-8 21:01 标题: 求解一道GWD数学题

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
这题的思路是怎样的？

作者: sayysong 时间: 2011-2-9 15:56

Category  2009 2010
price          p    (100+k)% * p
earning       e    (100+m)% * e
p/e             p/e [(100+k)/(100+m)] * [p/e]

percentage increase in p/e ratio = 100% * {[(100+k)/(100+m)] * [p/e] - [p/e]} / [p/e]
                                             = 100%* [(100+k)/(100+m) - 1]
                                             = 100% * [(k-m)/(100+m)]

作者: bettyofariN 时间: 2011-2-9 21:12

主要还是看题得看懂啊数学一般难不倒咱们天国学生。。。

作者: jaffa23 时间: 2011-2-10 21:34

many thanks @@@

作者: sayysong 时间: 2011-2-25 06:53

题目条件说一下雨就要回去，而问题问的是周一回去的概率，也就是问你周一下雨的概率并且周六周日不下雨
每天下不下雨时相互独立事件，周六不下雨的概率是0.8，周日不下的也是0.8，周一下雨概率是0.2 由于是相互独立事件，就把三个概率相乘

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