78.05% is what you get when you turn the fraction 32/41 into a percentage.
The fraction 32/41 is a little more than three‑quarters, so it’s close to 75%, but a bit higher. When you look at it as a percent, you see it’s just under 80%, which helps you compare it quickly to other numbers.
If you need to use this value in a report or a calculation, you can just write 78.05% and be confident it’s accurate to two decimal places. It’s a handy way to show the size of the part (32) relative to the whole (41).