use direct method or step method :)

Mack Precision Tool and Die has two production departments, Fabricating and Finishing, and two service departments, Repair and Quality Control. Direct costs for each department and the proportion of service costs used by the various departments for the month of March follow: Refer to the facts in Exercise 11-25. Mack Precision Tool and Die estimates that the variable costs in the Repair Department total $15,225, and in Quality Control variable costs total $39,200. Avoidable fixed costs in the Repair Department are $12,400. Required If Mack Precision Tool and Die outsources the Repair Department, what is the maximum it can pay an outside vendor without increasing total costs