11/85 as a percentage is 12.94%. This is the rounded value you get when you change the fraction into a percent form.
The fraction 11/85 means you have 11 parts out of a total of 85 equal parts. It’s a small piece of the whole, just a little over one‑tenth.
When you need to compare this amount with other numbers, using the percentage makes it easier. Saying 12.94% tells people quickly how big the part is relative to the whole, without having to work with the fraction directly.