The expression of percentage is :
[tex]\frac{Amount\text{ whose percent has to be calculate}}{Total\text{ Amount}}\times100=\text{ Percentage}[/tex]Since for the 20% of 140
Let x be the 20% of 140, then
[tex]\begin{gathered} \frac{x}{140}\times100=20\text{ percent} \\ 100x=20\times140 \\ x=28 \end{gathered}[/tex]So, the 20% of 140 is 28