Multiply the original price by the discount percentage (in decimal form) to find the discount amount, then subtract it from the original price. Example: 20% off €50 → 0.20 × 50 = 10; final price €40.
Multiply the bill amount by the tip percentage to find the tip, then add it to the bill. Example: 15% tip on €30 → 0.15 × 30 = 4.5; total €34.50.
Markup expresses how much you increase the cost to get the selling price (cost × (1 + markup %)), while margin is the difference between selling price and cost (profit), often expressed as a percentage of the selling price.
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