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30 April, 11:37

The total cost, including tax, of a $20 mouse for a personal computer is $21. What is the sales tax rate

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  1. 30 April, 15:11
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    Without tax it costs $20.

    With tax it costs $21.

    The amount of tax paid is $21 - $20 = $1

    $1 tax was paid on $20.

    $1/$20 * 100 = 0.05 * 100 = 5%
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