What is the surface area of this design?

Answer:
The surface area of this design is [tex]256\ in^{2}[/tex]
Step-by-step explanation:
we know that
The surface area is the area of the total faces of the solid
so
In this problem
[tex]SA=(5*8)*2+(8*5)*2+(8*4+4*4)*2=80+80+96=256\ in^{2}[/tex]