30/35 expressed as a percentage is 85.71%. This shows how much of a whole the fraction represents when turned into a percent. It’s a quick way to see the size of the fraction in everyday terms.
The fraction can also be reduced to 6/7 before thinking about percentages, but the value stays the same. Whether you write it as 30/35, 6/7, or 85.71%, the proportion does not change.
In practical use, you might see this percentage on a chart or a report where a part of a whole is shown. Knowing that 30 out of 35 equals 85.71% helps you compare it easily with other percentages.