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
accounting 500,000 number of invoices 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
number of invoices processed 700 800 500
number of employees 130 145 125

what is the service department charge rate for the personnel department?

(a) $2,758
(b) $3,200
(c) $1,000
(d) $3,077