49/80 as a percentage is 61.25%. This fraction is a little more than half, and the decimal form 0.6125 turns into a tidy percent when you move the decimal two places to the right.
When you see 61.25% on a chart or in a report, you know it represents the same size as the fraction 49 out of 80 parts. It’s a useful way to compare with other percentages that might be whole numbers or have different decimal places.
In everyday language, saying something is 61.25% complete or 61.25% of a whole is just a clearer, more familiar way to talk about the fraction 49/80. This makes it easier to understand quickly without having to think about fractions.