24/27 as a percentage is 88.89%. This is the rounded value you get when you compare the fraction to a whole.
The fraction 24/27 means you have 24 parts out of a total of 27 equal parts. Since it is close to 1, the percentage is also close to 100%, showing that the portion is fairly large.
In everyday use, you might see this percentage on a report card, a test score, or a performance rating. Remember that the figure is rounded to two decimal places, so the exact value may be a tiny bit higher or lower.