ABC Corporation has three service departments with the following costs and activity base: Service Department Cost Activity Base for Allocation Graphics Production $200,000 number of copies number of invoices Accounting 500,000 processed Personnel Department 400,000 number of employees ABC has three operating divisions, Micro, Macro and Super. Their revenue, cost and activity information are as follows: Micro Macro Super Direct revenues $700,000 $850,000$650,000 Direct operating expenses 50,000 70,000 100,000 Number of copies made 20,000 30,000 50,000 700 Number of invoices processed 500 800 145 125 Number of employees 130 What is the service department charge rate for the Accounting Department? a. $0.004 b. $625 C. $250 d. $714