5) Chumley Advertising Agency contracted with a company to prepare an ad campaign. Chumley uses a job order costing system. Ch staff hours at $45 per hour. Chumley uses two overhead rates in applying overhead to jobs: Designer-related at $100 per designer hour and staff-related at $50 per staff hour. Determine the total estimated cost for this job umley estimates that the job will take 140 designer hours at $90 per hour and 85