21/77 as a percentage is 27.27%. This value shows how much of a whole the fraction represents when we look at it in terms of parts per hundred.
The fraction 21/77 can be simplified by dividing both the numerator and the denominator by 7, giving 3/11. Even after simplifying, the percentage stays the same because it reflects the same proportion of the whole.
When you see 27.27% on a chart or a report, you know it comes from the original fraction 21/77. It’s a quick way to understand the size of that part compared to the entire set.