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Discounts, sales tax and original prices
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Learn it Sale price = original × (1 − discount). With 13% sales tax: × 1.13. To find the original from a sale price, divide by (1 − discount).
Example: After 20% off, a game costs $\$48$. What was the original price?
- The sale price is 80% of the original: $0.8 \times \text{original} = 48$.
- $\text{original} = 48 \div 0.8 = 60$.
- Original price: $\$60$.
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