25.64% is what you get when you turn the fraction 20/78 into a percentage. This number tells you how much of a whole 20 is when the whole is divided into 78 equal parts.
The fraction 20/78 can be simplified to 10/39, but the decimal form still points to the same percentage. Seeing it as a percent makes it easier to compare with other values, like grades or interest rates, because most people think in terms of out of 100.
In everyday life, you might use this percentage when you need to know a portion of a group, such as 20 out of 78 students who passed a test. The 25.64% figure gives a clear, quick picture of the proportion.