17/50 expressed as a percentage is 34.00%. This number tells you how much of a whole the fraction represents when you think in terms of one hundred parts.
The fraction 17/50 can also be thought of as 17 parts out of 50 equal pieces. When you compare those pieces to a set of 100, you get the same proportion, which is 34 out of 100, or 34.00%.
In everyday use, you might see this percentage on a test score, a discount, or a statistic. Knowing that 17/50 equals 34.00% makes it easy to interpret the value in familiar terms.