28/90 as a percentage is 31.11%. This is the rounded value you get when you change the fraction into a percent, and it’s useful for quick comparisons.
The fraction 28/90 can also be simplified to 14/45, which still represents the same part of a whole. Seeing it as a percentage helps you understand that it’s a little over one‑third of the total.
Whenever you need to talk about parts of a whole in everyday language—like a grade, a discount, or a test score—turning the fraction into a percent, such as 31.11%, makes the information clear and easy to use.