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Tax, discounts and original prices
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Learn it Multiply by one factor for each change: a 20% discount is × 0.8, 13% tax is × 1.13. To undo a change, divide by the same factor.
Example: After 13% tax a bill is $\$56.50$. Price before tax?
- Bill = price × 1.13.
- Price = $56.50 \div 1.13$.
- Price = $50.00.
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