39/40 as a percentage is 97.50%. This number shows just how close the fraction is to a whole.
The fraction 39/40 means you have 39 parts out of 40 equal parts. When you look at it as a percent, you can see that it is almost a full 100%, which makes it useful for quick comparisons.
Because the percentage is rounded to two decimal places, the value is precise enough for most everyday uses, such as grading, budgeting, or measuring progress.
In short, whenever you see 39/40, you can think of it as 97.50%, a handy way to understand the size of the fraction at a glance.