In order to calculate the markup, let's subtract the selling price by the cost of the product:
[tex]\begin{gathered} \text{markup}=6.82-5.36 \\ \text{markup}=1.46 \end{gathered}[/tex]Therefore the markup is $1.46
Now, to find the rate of markup, we divide the markup by the cost:
[tex]\text{rate}=\frac{1.46}{5.36}=0.272=27.2\%[/tex]Therefore the rate of markup is 27.2%.