(A) The volume is the product of the area of the base and the height.
V = Bh
V = (8 ft²)×(6 ft) = 48 ft³
The volume of the file cabinet is 48 ft³.
(B) Same deal, shorter height.
V = (8 ft²)×(4 ft)
V = 32 ft³
The volume of the shorter file cabinet is 32 ft³.