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29 October, 00:51

Percent change

15 books to 21 books

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Answers (1)
  1. 29 October, 03:48
    0
    1st step is to find the difference:

    21 - 15 = 6 books

    now divide the difference by the original quantity:

    6 / 15 = 0.4

    multiply that by 100 to get the percentage:

    0.4 x 100 = 40% increase
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