To find the comission rate we just have to divide the total comission by the total amount of merchandise sold. The comission was $364 and the amount of merchandise sold was $2800.
![(364)/(2800)=0.13](https://img.qammunity.org/2023/formulas/mathematics/college/vl60fcjubg512sxloamnqppzacp0ks5fri.png)
Then, to rewrite a decimal as a percentage, we just need to multiply the number by 100.
![0.13=(0.13*100)/(100)=(13)/(100)=13\%](https://img.qammunity.org/2023/formulas/mathematics/college/gqq4w459908lsqlr5x8cgv76jaj1mu7ml2.png)
The comission rate is 13%.