Commission, markup, tips and successive discounts

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Learn it Commission and markup are percents OF a base amount, then added on. Successive discounts multiply: 20% off then 10% off is × 0.8 × 0.9 = × 0.72 (28% off, not 30%).

Example: A $\$200$ coat is 20% off, then members get 10% off the sale price.

After 20% off: $200 \times 0.8 = 160$.
After 10% more: $160 \times 0.9 = 144$.
Pay $\$144$ (a 28% total discount).

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