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- 精华
- 6
- 积分
- 3353
- 经验
- 3353 点
- 威望
- 335 点
- 金钱
- 335 ￥
- 魅力
- 335
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GWD-28
Q28:
Last Sunday a certainstore sold copies of Newspaper A for $1.00 each and copies of Newspaper Bfor $1.25 each, and the store sold no other newspapers that day. If r percent of the store’s revenuesfrom newspaper sales was from Newspaper A and if p percent of thenewspapers that the store sold were copies of newspaper B, 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)
这道题目的答案是D
可是我算了8遍还是一个和答案差万里的表达式(40000-400p)/(p-400)
晕了都！
麻烦各位指教 |
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