57/99 as a percentage is 57.58%. This is the rounded value you get when you express the fraction as a percent with two decimal places.
The fraction 57/99 is a little more than one‑half. It can be reduced by dividing both numbers by 3, giving 19/33, which still represents the same size. When you write it as a decimal, it repeats: 0.575757…, which is why the percentage ends with .58 after rounding.
In everyday use, 57.58% can help you compare parts of a whole quickly, such as test scores, survey results, or any situation where a proportion needs to be understood at a glance. The rounded figure keeps things simple while staying accurate enough for most practical purposes.