Terms and Symbols Used in This Work
| Term | Symbol | Meaning |
| Cost price | CP | the price paid when buying |
| Marked price | MP | the price written on the item |
| Discount | D | the amount taken off the marked price |
| Selling price | SP | the price the customer pays after the discount |
| Profit | P | SP minus CP, when SP is the larger |
| Loss | L | CP minus SP, when CP is the larger |
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