39/95 as a percentage is 41.05%. This number tells you how much of a whole 39 parts represent when the whole is split into 95 equal pieces.
The fraction 39/95 can be thought of as 39 out of 95 parts. It is already in its simplest form because the numerator and denominator share no common factor other than 1. Seeing it as a percentage makes it easier to compare with other values that are also expressed in percent.
When you need a quick estimate, you can remember that 40% is roughly 40 out of 100. Since 39/95 is close to that, the exact percentage of 41.05% fits right between the two, giving a clear picture of its size.