question is in picture :) help me work out this problem

Given
Since they are similar
[tex]\begin{gathered} \frac{10}{4}=2.5 \\ \\ \\ \\ The\text{ scale factor is 2.5} \end{gathered}[/tex][tex]The\text{ square of scale factor=2.5}^2=6.25[/tex]Then multiply
[tex]6.25\times30=187.5[/tex]The final answer
[tex]187.5m^2[/tex]