As the managing partner of Sheffield Accounting Services (HAS), Adam is trying to compare the profitability results of the firm's three different business lines: Audit, Tax, and Advisory Services. These three operating divisions are supported by three support departments: Billing, Human Resources, and IT. The cost drivers (or allocation bases) for each of the support departments, along with each department's usage of those services and its own original costs, are as follows. Support Departments Operating Divisions Billing HR IT Audit Tax Advisory Totals Original cost $67,000 $125,000 $94,000 $499,000 $755,000 $294,000 $1,834,000 Billing hours used - - - 2,000 1,400 600 4,000 Number of employees 2 1 12 15 3 35 IT hours used 100 200 200 900 600 300 2,300 (b) Rank the three support departments based on the percentage of their service provided to other support departments, and then allocate their costs using the step method. (Round intermediate calculations to 4 decimal places, e.g. 15.2516 and final answers to 2 decimal places, e.g. 15.25.) Total $ Audit $ Tax $ Advisory $ Total