79/100 as a percentage is 79.00%. This is the exact value you get when you turn the fraction into a percent and round it to two decimal places.
The fraction 79/100 means you have 79 parts out of a total of 100 equal parts. It is already very close to a whole number, so when you write it as a percent it looks just like a normal number you might see on a price tag or a test score.
People use this percentage when they need to compare amounts easily. For example, a quiz score of 79/100 would be reported as 79.00%, showing clearly how much of the total was earned. This makes it simple to see performance at a glance.
