The fraction 78/81 as a percentage is 96.30%. This tells you that the value is just a little below a whole (100%).
Since 78 and 81 share a common factor of 3, the fraction can be reduced to 26/27, which is still a very large part of a whole. That’s why the percentage is so close to 100%.
In everyday situations, a result of 96.30% might represent a high score on a test, a strong performance rating, or an almost‑complete fill level in a container. It’s a useful way to see how close something is to being complete.