1/80 = 1.25%
A value like 1/80 can show up when a small fee, chance, or portion is involved. For example, a store might offer a tiny discount on a large purchase, or a rare event might have about a 1.25% chance of happening.
To picture 1/80 quickly, imagine dividing a group of 80 people or objects into equal parts and choosing just one. It is a little more than one out of every 100, so you can think of it as a small slice that is noticeable but still quite rare.
A common mistake is to treat 1/80 as if it were 80%, because the number 80 stands out. The denominator tells you the whole is split into 80 equal parts, so the fraction represents only one of those parts.