Answer:
50,000 Square feet
Explanation:
Building maintenance provides more service than human resource and this means the cost of Building maintenance departments would be allocated to all remaining three department including human resource department.
Square feet over which Building Maintenance cost would be allocated = Square Footage of Human Resources + Square Footage of Machining + Square Footage of Assembly
= 6,000 + 18,000 + 26,000
= 50,000