Avoid wrong base, confused discount logic, and reverse ratio mistakes.
What to focus on
- Profit% and Loss% are based on CP, not SP.
- Discount% is based on MP, not CP.
Quick formula / idea
- Right base = right answer
Selling at 20% loss means SP:CP = 80:100 = 4:5, not 5:4.
Practice prompts
- Explain why discount and loss are not the same thing.
- Convert 25% loss into SP:CP ratio.