71/78 as a percentage is 91.03%. This fraction is pretty close to a whole number, so when you see it expressed as a percent it shows just how large it is—over ninety percent of a full unit.
In everyday terms, 71 out of 78 parts means you have most of the whole. If you think of a pizza cut into 78 slices, having 71 slices would give you a very big bite—almost the entire pizza.
The percentage format makes it easy to compare with other numbers. For instance, a score of 91.03% on a test would be considered an A in most grading systems.
Because the fraction and the percent are so close to 1 (or 100%), they are useful when you need to show that something is almost complete without saying “almost all”. This can be handy in reports, presentations, or simple explanations.