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26 February, 08:46

Martin finds a shirt on sale for 10% off at a department store. the original price was $20 martin must also pay 8.5% sales tax. how much is the shirt before taxes are applied?

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  1. 26 February, 09:10
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    Normally it is

    cost times discount, then the discounted price times sales tax

    so since we want before tax is applied, we disregard the 8.5% and find the 10% off

    10% off means 90% (100-10=90)

    so 90%=90/100=9/10

    9/10 of $20

    'of' means multiply with fractions

    9/10 times 20=180/10=18

    the shirt is $18 before tax
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