Answer :
First, we have to find the percent that went to social issue on saturday
[tex]\begin{gathered} 384+389+495=1,268 \\ \frac{389}{1268}=0.307=30.7\text{ \%} \end{gathered}[/tex]So, with this we can calculate the Sunday amount
[tex]1300(0.307)=399.1=399[/tex]399 people are expected to go to Social Issues