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Explain why the cost of an item discounted 20% and then taxed 8% can be calculated by multiplying the original price by 0.864
13 years ago

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Steve
If you let p be the original price, the discounted price is 0.8p

Add a ta xof 8% on 0.8p and you have (1.08)0.8p = 0.864p
13 years ago

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