Concept of percentage or Percentage formula

By a certain percent, we mean that many hundredths.

Thus, x percent means x hundredths, written as x%.

To express x% as a fraction: We have, x%

\begin{aligned} \frac{x}{100} \\
Thus, & 10\% = \frac{10}{100} = \frac{1}{10} \\
30\% = \frac{30}{100} = \frac{3}{10} \\
\end{aligned}

In simple terms we can conclude that percentage symbol "%" means 1/100

In case we are having a fraction and we have to calculate its percentage then we will multiply it by 100.
that is,
\begin{aligned}
\frac{a}{b} = \left(\frac{a}{b}\times100\right)\%
\end{aligned}

So if we get a question like 1 is what percent of 4, then we will solve it as,

\begin{aligned}
\frac{1}{4}*100 = 25\% \\
Similarly & \frac{3}{5}*100 = 60\% \\
\end{aligned}