Amberro12 Amberro12

18-04-2018
Mathematics

contestada

Percent change

15 books to 21 books

Respuesta :

musiclover10045 musiclover10045

18-04-2018

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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