Answer:
C, $640
Explanation:
the problem mentions cubic feet so we're dealing with volume
volume of a rectangular prism = l x w x h
volume of a triangular prism is half of the volume of a rectangular prism or 1/2 (l x w x h)
so... input the values!
rectangular prism = 4 x 8 x 3 = 96 cu.ft
triangular prism = 4 x 8 x 5 = 160 cu.ft ( side note: since the triangular prism is directly on top of the rectangular one, the two prisms share same w and l )
together the barn's volume is 256 cu.ft or 96+160
we know 1 cu.ft is $2.5 so we multiply 256 with 2.5
256 x 2.5 = 640 or C!!!!!!!!!
lmk if u got any questions :>