Answer:
92400m
Step-by-step explanation:
<em>Find the volume of the two rectangles.</em>
Volume of a rectangle: length*width*height
The first, larger rectangle: 64*60*28=107520m
The second, smaller rectangle: 18*30*28=15120m
<em>Subtract the two rectangles' volumes for the building's total volume.</em>
107520-15120=92400m
