[tex]\begin{gathered} \text{Number of students}\Rightarrow25 \\ \text{Went on }trip\Rightarrow21 \\ \text{percentage}=\frac{21}{25}\times100 \\ \text{percentage}=84\text{ \%} \\ So,\text{ the percentage of class went on the trip is 84\%.} \end{gathered}[/tex]
