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Q28: Last Sunday a certain store soldcopies 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)
偶算来算去就算出r+p=100,或者各种白痴无用东西。
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发表于 2013-6-29 05:11:27
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