12.82% is what you get when you turn the fraction 10/78 into a percentage.
The fraction 10/78 is a simple way to show that for every 78 parts, 10 of them are being counted. It can be reduced to a smaller fraction, but the value stays the same.
Seeing the percentage helps when you need to compare it with other numbers that are already in percent form, like test scores or interest rates.
In everyday situations, you might use this kind of conversion to understand parts of a whole—like how much of a budget is spent, or what portion of a group meets a certain criteria.
