Answer:
9.25%
Step-by-step explanation:
We have the price book of $40 but karen pais $43.70 then the $3.70 extra that she paid it's the value of taxes. Then to know the tax rate we have to do the next procediment:
[tex]$40\longrightarrow 100\%[\text]
[tex]$3.70\longrightarrow x\%[/tex]
Where x is the tax rate, then:
[tex]x=\dfrac{\$3.70\cdot 100\%}{\$40}[/tex]
[tex]x=\dfrac{370\%}{40}=9.25\%[/tex]
