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22 May, 22:13

15 books to 21 books percent of change

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  1. 23 May, 02:04
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    Percent change formula is:

    change/original * 100

    (21-15) / 15 * 100

    6/15 * 100

    .4 * 100

    40% since the number of books went UP it is a percent increase.
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