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Question 2: Job-Order Costing: Calculating unit product costs Custom Corporation uses ajob-order costing system with a single plantwide predetermined overhead rate based on machine-hours. The company based its predetermined overhead rate for the current year on the following data: Total machine-hows 20,000 Total fixed manufacturing overhead cost $80,000 Variable manufacturing overhead per machine-hour $3.00 Recently Job G215 was completed with the following characteristics: Number of units in the lob 40 Total machine-hours 70 Direct materials $910 Direct labor cost $3,600 Required: a. Estimate the total manufacturing overhead cost. (3 marks) )3. Calculate the predetermined overhead rate for the year. (2 marks) c. Calculate the amount of overhead applied to Job (3215. ( 2 marks) d. Calculate the total job cost for Job G215. {3 marks) e. Calculate the unit product cost for Job G215. (2 marks) f. Why do most companies use predetermined overhead rates rather than actual overhead rates