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9 January, 19:34

To decrease an amount by 19% multiply by

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  1. 9 January, 22:23
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    Think of the original amount as 100%

    If we want 100% of something we multiply by 1

    To get from 100% to 1, we divide the percentage by 100

    Decrease 100% by 19%

    100% - 19% = 81%

    Then to get the multiplier, divide by 100

    81% / 100 = 0.81

    To decrease by 19%, multiply by 0.81
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