12/50 as a percentage is 24.00%. This is the rounded value you get when you express the fraction in terms of hundredths.
The fraction 12/50 can also be simplified to 6/25, but the original form is often easier to recognize in everyday problems, like when dealing with parts of a whole.
In many reports and presentations, percentages are shown with two decimal places for consistency, so you’ll see 24.00% used instead of just 24% to match the formatting style.