When you turn the fraction 16/20 into a percentage, you get 80.00%. This is the same value expressed in a form that’s easy to compare with other percentages.
The fraction 16/20 can be reduced to 4/5, which still represents the same portion of a whole. Both 4/5 and 16/20 describe a situation where four out of every five parts are present.
In everyday life, you’ll see 80.00% used for things like test scores, discounts, or statistics. It’s a quick way to show that four‑fifths of something is being considered.