61/79 as a percentage is 77.22%. This fraction is a bit more than three‑quarters, and when you look at it on a chart it fills almost 80 % of the space.
The numerator 61 is close to three‑quarters of the denominator 79, which is why the percentage lands just under 80 %. If you imagine a pizza cut into 79 slices, you would have 61 slices, leaving only a small part missing.
In everyday use, you might round this to 77 % for quick estimates, but the exact rounded value to two decimal places is 77.22%. This makes it easy to compare with other numbers, like test scores or discounts, that are also shown as percentages.