30/33 as a percentage is 90.91%. This is the exact value when the fraction is turned into a percent and rounded to two decimal places. It shows that the fraction is just a little under one whole.
The fraction 30/33 can be reduced to 10/11, which still gives the same percentage. In everyday life you might see this kind of number when comparing parts of a whole, like a test score or a share of a group.
Knowing the percentage helps you quickly see how large the portion is. 90.91% means the part is almost the whole, so 30 out of 33 is a very high amount.
