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【OG20-P179-216题】
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 revenue 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 ?
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设:报纸总数为100,A为p,那么B为100-p
r=
*100%=>
p=
*100%=>p=100p 代入R
r=
化整上下都乘以4
r=
题目讨论 (10条评论)

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ziqi
设报纸总数为100这种具体的数好解(不影响结果
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0 回复 2022-06-13 21:16:04
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365962xlv
pick smart numbers, say total of 100 = A+B, A=60, B=40 (picked 40 because it multiplies evenly with 1.25). Proportion revenue for A, r/100 = 60/(60+50)= 6/11. If p = 60, plug in the choice... if you use number sense, you should see that B and D have higher chances of getting 6/11 than A,C,E...
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0 回复 2022-01-17 21:57:49
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追梦的猪猪
A B 报纸的收入比例为 r%/(1-r%)=p%*1/(1-p%)*1.25 = 4p%/5(1-p%) 两边上下都乘以 100,去掉百分号,然后得出 r=400p/(500-p)
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0 回复 2021-11-03 14:13:32
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贾思敏
从理解题目到列出等式花了挺长时间的,导致这道题花的时间有点长,反思一下: 设报纸总数为100 卖出A报纸的数量:100*p%=p 卖出A报纸获得的收入:p 卖出B报纸的数量:100-p 卖出B报纸获得收入:1.25*(100-p)=125-1.25p total revenue总收入:p+125-1.25p=125-0.25p=0.25(500-p) 由第一个if从句可以列出等式:r%*total revenue=p 也就是r*0.25*(500-p)=100p r=100p/0.25(500-p)=400p/500-p
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0 回复 2021-10-05 18:48:20
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如果有时间的话我也能做对
译文: 如果r %的报纸销售收入来自报纸A, p %的报纸销售收入来自报纸A....这样出题你喊我要咋个理解?
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1 回复 2021-07-10 23:03:18
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1521764tlyg回复如果有时间的话我也能做对
我一开始也是这么看的,后面发现题目说的是r%收入来自报纸A,p%的销量来自报纸A
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0 回复 2021-10-14 22:26:07
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沙沙冲700+
注意r,p都是代表A报纸,注意是百分比
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0 回复 2019-12-02 08:48:16
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默默
两种收入的比值
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0 回复 2018-04-22 11:12:52
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( ¨̮ )
什么鬼答案A明明是r 一个店卖报,A报1刀每份,B报1.25刀每份.那天没有其他报纸卖.如果该店总收入的R%来自a报纸的销售,B报纸占销量的P%,求用P表示R. 由题意得:A销量(100%-P%)X,B销量P%X R%=A总利润除以(A+B)的总利润 R%=1*(100%-P%)X/(1*(100%-P%)X+1.25*P%X) 提出X约了,再化简一下 最后R%=(100%-P%)/(100%+0.25P%)
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1 回复 2018-04-06 10:32:59
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李明朗回复( ¨̮ )
傻逼
2
5 回复 2018-10-14 22:45:58
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mengdan
revenue不应该是sale price减去cost的差乘以数量吗,这道题的cost跑哪里去了
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0 回复 2017-12-01 11:05:07
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你喊我回复mengdan
Profit才是要减去成本的。
3
0 回复 2017-12-08 16:12:29
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lulugogo
设卖报纸总数为1,
销售数量:报纸A:1*p%;报纸B:1-p%;
收入= 数量*单价: 报纸A: 1*p%*$1;报纸B: (1-p%)*$1.25
所以:r% = (1*p%*$1 )/(1*p%*$1)+ (1-p%)*$1.25
r=p/1.25-0.25*p% = 400p/500-p
选D
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0 回复 2017-09-07 01:10:58