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29 November, 10:21

Martin finds a shirt on sale for 10% off at a store. The original price was $20. Martin must pay 8.5%. How much is the shirt after sales taxes are applied?

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  1. 30 November, 08:51
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    I take it you meant, he's going to pay 8.5% in sales tax.

    whatever% of anything is just (whatever/100) * anything.

    thus, 10% of 20 is (10/100) * 20, or just 2 bucks.

    so, the shirt was 20, but went down by 2 bucks, so is 18 then.

    now, here cometh the taxman, 8.5% on that 18 is? well, yes, you guessed it, (8.5/100) * 18, or 1.53.

    so, Martin ended up paying 18 + 1.53.
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