Solution:
1. Power is allocated first because 20 percent of its services is used for other support department (in this case, Maintenance). Only 10 percent of Maintenance services are used by other support departments. Allocation ratios:
3. If Maintenance used only 100,000 kilowatt-hours, then the proportion of service it uses would drop to 11.11%. Power would still be allocated first; however, the allocation ratios for Power would change to Maintenance, 11.11%; Grinding, 66.67%; and Assembly, 22.22% (rounded). Thus, relatively fewer dollars would be allocated to Maintenance, and relatively more to Grinding and Assembly. The new allocations would be as follows:
Note: The totals after allocation do not precisely sum to the before allocation totals due to rounding.