27/52 as a percentage is 51.92%. This means that the fraction is just a little more than half of a whole.
The fraction 27/52 cannot be reduced any further, so it stays exactly as it is. When you think of it in everyday terms, imagine 52 equal pieces of a pizza; 27 of those pieces would be a little more than half of the pizza.
Seeing the percentage helps you compare it with other numbers that are already in percent form. For example, 51.92% is close to 50%, which is exactly half, but a bit larger.
In reports or school projects, you can write the fraction as 51.92% to make the data easier to read, especially when most other values are already shown as percentages.