practice: add questions on profit and loss

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json
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content

调研方向

先阅读 shared/practice/questions.json 中现有的定量问题,并遵循其结构。添加三道原创的盈亏问题,使用新的小写 ID、四个不同的选项、有效的 answerId、详细的解题说明,并将主题设为定量、难度设为简单或中等。运行 npm ci 和 npm test;问题库检查通过后即完成。

由索引模型根据 Issue 内容生成。

描述

enhancement good first issue

What to add

Add 3 original multiple-choice questions on profit and loss to the quantitative topic in shared/practice/questions.json.

The quantitative topic has 6 questions and none of them cover profit and loss yet. Some ideas (write your own wording and numbers):

  • find the selling price from the cost price and a profit percentage
  • find the profit or loss percentage from the cost price and selling price
  • find the cost price when the selling price and profit percentage are known

Look at the existing quantitative questions in the file first and follow the same shape.

Requirements

  • The questions must be your own. Do not copy from books, websites, coaching material, or past papers.
  • Each question has exactly 4 options (a to d), one answerId, and an explanation that shows the reasoning or working, not only the answer.
  • Use "topicId": "quantitative" and "difficulty": "easy" or "medium". A mix of both is welcome.
  • Give each question a new lowercase ID, for example quant-profit-percent. Do not change existing IDs.
  • Indian context is welcome (Rs, km, common names).

Check your change

npm ci
npm test

npm test checks the question bank (unique IDs, four distinct options, a valid answer). If you have the .NET SDK, also run dotnet test backend/ProCoderJi.slnx --configuration Release. If you don't, CI runs the backend tests on your pull request.

Before you start

Leave a comment here when you start so others can pick a different issue. New to open source? Start with CONTRIBUTING.md. Questions are welcome in the comments.

主要语言
TypeScript
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从这里开始

  1. 先读完整个 Issue,再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

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