6/80 as a percentage is 7.50%. This tells you how much of a whole the fraction represents when you look at it in terms of hundredths.
The fraction 6/80 can be simplified to 3/40, but its size stays the same. Whether you write it as 6/80, 3/40, or 7.50%, the value doesn't change.
Knowing the percentage makes it easy to compare this amount with other percentages, like discounts or test scores, without having to work with fractions. It's a quick way to see that the portion is a little less than one‑tenth of a whole.
