To calculate the volume of the desk, we need to multiply the length, width, and height of the desk together.
Volume = Length x Width x Height
Volume = 40 in x 12 in x 24 in
Volume = 11,520 in³
However, since the two legs in the middle of the desk are not part of the enclosed space within the desk, we need to subtract their volume from the total volume.
Volume of two legs = (10 in x 12 in x 18 in) x 2
Volume of two legs = 4,320 in³
So, the final volume of the desk is:
11,520 in³ - 4,320 in³ = 7,200 in³
Therefore, the correct answer is:
7,200 in.3