兩道 GWD04 : 05 & 17

請教一下 這兩道題 搞不大清楚 題目的意思 謝謝

GWD04-Q5:

A certain club has 20 members.  What is the ratio of the member of 5-member committees that can be formed from the members of the club to the number of 4-member committees that can be formed from the members of the club?

A.    16 to 1

B.     15 to 1

C.     16 to 5

D.    15 to 6

E.     5 to 4

Answer: C

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Q17:

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

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第二题我做的刚才做的时候把答案看成E了，郁闷了半天

是这样的：去年，股票x每股价格长k%，每股收益长m%，k>m；问：价格相对收益增长的比率为多少，用k跟m来表示

解：设去年股票x每股价格为x，每股收益为y，

那么依题意今年每股价格就是x（1＋k%）,每股收益就是y(1+m%)，

价格相对收益增长的比率很明显增加了，所以

增加的比就是：

{[x（1＋k%）/y(1+m%)]/(x/y)}-100%=[100(k – m)] / (100 + m) %

謝謝 Jeffxf兄 感激不盡

终于找到解答了。。。