Question

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

Answer 1

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:

`\begin{gathered} \text{\%}increase=Increase/ OriginalNumber*100\text{\%} \\ \text{\%}increase=(21-15)/(15)*100\text{\%} \\ \text{\%}increase=(6)/(15)*100\text{\%}=40\text{\%} \\ \text{\%}increase=40\text{\%} \end{gathered}`