GWD 3 18

Kath1985

Q18:
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) %
答案D    請教兩問題: 感激

1.P和E為什麼不用寫出來 ? 如下


[attachimg=451,239]78721[/attachimg]

2 演算的過程如下,但為何分母的100要變成% 而不是和分子100上下消掉呢?
[attachimg=623,515]78722[/attachimg]