GWD5-28(濤濤版)

查過了, 沒有link, 化了好久化不出來, 請NN指教, 感激不盡!!

Last Sunday a certain store sold copies of Newspaper A for $1.00 each and copies of Newspaper B for $1.25 each, and the store sold no other newspapers that day.  If r percent of the store’s revenues from newspaper sales was from Newspaper A and if p percent of the newspapers that the store sold were copies of newspaper A, which of the following expresses r in terms of p?

A.      100p / (125 – p)

B.      150p / (250 – p)

C.      300p / (375 – p)

D.      400p / (500 – p)

E.       500p / (625 – p)

答案: D