78/90 as a percentage is 86.67%. This value tells you how much of a whole the fraction represents when you look at it in terms of hundredths.
The fraction 78/90 can be reduced to 13/15, but it still equals the same percentage. Whether you write it as 78/90 or 13/15, the proportion stays the same.
Seeing the number as a percentage makes it easier to compare with other values, like test scores or discount offers. For example, an 86.67% rating is quite high and shows strong performance.
Remember that the percentage is rounded to two decimal places, so the exact value might be a tiny bit different, but 86.67% is the standard way to present it.
