84/99 as a percentage is 84.85%. This is the rounded value you get when you turn the fraction into a percent.
The fraction 84/99 is just a little bit less than 85 out of 100, so it’s close to 85 %. When you see 84.85% you know the original numbers are almost equal to that whole‑number percent.
In everyday terms, thinking of 84.85% helps you understand how large the part (84) is compared to the whole (99). It’s a handy way to talk about the size of something in everyday language.