30/50 as a percentage is 60.00%. This is the simple way to see how the fraction relates to a whole.
The fraction 30/50 can be reduced to 3/5, which still represents the same part of a whole. When we talk about 60.00 % we are saying that the part is sixty out of one hundred equal pieces.
In everyday life this kind of number shows up a lot. For example, if you score 30 points out of a possible 50 on a test, you have earned 60.00% of the total possible points.
Remember, fractions and percentages are just two ways to describe the same portion, so you can use whichever form is easier for the situation.