The box is a square prism; therefore, its surface area is given by the formula below
[tex]\begin{gathered} A=2l^2+4lh \\ l\rightarrow\text{ side of the square base} \\ h\rightarrow\text{ height} \end{gathered}[/tex]
Therefore, in our case,
[tex]A=2*9^2+4*2*9=162+72=234[/tex]
Thus, the answer is 234in^2
