Answer:
[tex]V=168 \ in^3[/tex]
Step-by-step explanation:
-The box material is 0.5 inches thick.
-The inside dimensions are therefore an inch thick less each.
-The volume of the inside is then calculated as;
[tex]V=lwh\\\\=(8-0.5\times 2)\times (9-0.5\times 2)\times (4-0.5\times 2)\\\\=7\times 8\times 3\\\\=168 \ in^3[/tex]
Hence, the inside volume is [tex]168 \ in^3[/tex]