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you Owens 15 books before Christmas,but after Christmas you now own 21 books. is this a decrease or increase explain.find the percent of change

Sagot :

Let's begin by listing out the given information:

Before Christmas: 15 books

After Christmas: 21 books

This is an increase

The percentage increase is given by % increase = Increase ÷ Original Number × 100:

[tex]\begin{gathered} \text{\%}increase=Increase\div OriginalNumber\times100\text{\%} \\ \text{\%}increase=\frac{21-15}{15}\times100\text{\%} \\ \text{\%}increase=\frac{6}{15}\times100\text{\%}=40\text{\%} \\ \text{\%}increase=40\text{\%} \end{gathered}[/tex]

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