20/81 as a percentage is 24.69%. This value tells you how much of a whole 20 parts out of 81 represent when you think of the whole as 100 %.
The fraction 20/81 is a little less than one quarter. When you compare it to everyday numbers, it’s close to 1/4, which is 25%, so the percentage being a tiny bit lower makes sense.
If you need to use this number in a report or a quick calculation, just remember the rounded figure 24.69%. It’s easy to write and clear to read.