紧急求助一道经济类数学题！

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L’Oréal Paris is organizing a promotional activity for the Derma Genesis anti-aging product line: an SMS (Short Message Service) campaign offering Derma Genesis night cream for $15 instead of $20. The 3000 recipients of this message will be extracted from the aufeminin database. Recipients will include only women over 40 years old who have agreed to be contacted by SMS on behalf of the site’s partners.
The project’s invoice components are:
- Address rental and transmission: $0.40, taxes included
- Technical fees: $250 per extraction
- Extraction cost: $50 per criterion


Knowing that the profit margin of Derma Genesis night cream at the $15 promotional price is $5, what do you think the return rate will have to be in order to show a profit?



1.
7.33%
2.
10.33%
3.
12.33%
4.
14.33%

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关键词：紧急求助 数学题 经济类 急求助 Transmission 求助 经济 数学题

profit margin不是应该是一个比率么？怎么会是一个具体数值？

原题就是这样，是欧莱雅出的题目，应该不会错。。。
我搞不懂profit margin 和 return rate到底要怎么算。。
目前只知道这个项目的成本是0.4×3000+250+50×3=1600元

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