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AEU company uses job order costing system. There are 2 production departments, Machining and assembly. A predetermined rate is used in each department. The machining department bases its PR on machine hours and the assembly Department bases its rate on direct labour hours. The company made the following estimates at the beginning of the year. Machining Assembly 20,000 15000 Machine hours Direct Labour Hours Overhead cost 9000 40,000 $200,000 $850,000 The following information was available for Job No. 12 which was started and completed during December Machining Assembly Direct Materials $2,000 $-0 DL Cost $1200 $5,500 DLH 30 200 Machine Hours 250 50 Units completed 450 260 REQUIRED 1. Calculate predetermined rate used by each department 2. Compute the total cost of each department 3. Compute unit cost for each department 4. Calculate the total cost of the job