11/73 as a percentage is 15.07%. This fraction represents a small part of a whole, and when you turn it into a percent you get a number that's easy to compare with other percentages.
The value 15.07% can show up in everyday situations, like a tiny discount on a product or a modest share of a vote. Knowing the percent makes it clear just how big or small the part is without having to think about fractions.
The figure is rounded to two decimal places, so the true value is a little bit more precise, but 15.07% is the standard way to report it in most reports and charts.