20/50 as a percentage is 40.00%. This is the direct answer you’re looking for.
The fraction 20/50 can be simplified to 2/5, which still represents the same part of a whole. Whether you write it as a fraction or a decimal, the value stays the same.
In everyday use, saying “40 %” is often enough, but writing 40.00% shows the result rounded to two decimal places, keeping the format clear and precise.