The fraction 20/49 is equal to 40.82%. This means that if you split something into 49 equal parts and take 20 of those parts, you have about 40.82 out of every 100 parts.
Writing 20/49 as a percentage lets you compare it easily with other numbers that are already in percent form. It shows that the fraction is less than half, but still fairly close to 50%.
In everyday use, you might see this percentage when dealing with grades, discounts, or statistics. Knowing that 20/49 is 40.82% helps you quickly understand its size without doing the math each time.