3-18:
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:
不会做.谁能指点一下?
假设第一年的价格和收入分别为 P1, E1;第二年的价格和收入分别为P2, E2. 根据题意,
P2=(1+k%)P1 and E2=(1+m%)E1
问题是 (P2/E2-P1/E1)/(P1/E1)=?%
解答如下:
把两个等式相除, 得到关系: P2/E2=(1+k%)/(1+m%)* P1/E1,
代入到问题中,得到(k-m)/(100+m),换成百分比,就是D答案了.
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