Al Rawahi Manufacturing Company uses a job order cost system in each of its three manufacturing departments. Manufacturing overhead is applied to jobs on the basis of direct labour cost in Department E, direct labour hours in Department G, and machine hours in Department I. In establishing the predetermined overhead rates for 2019, the following estimates were made for the year. Department X Y Z Manufacturing overhead $900,000 $1,800,000 $840,000 Direct labour costs $1,500,000 $1,250,000 $450,000 Direct labour hours 100,000 125,000 40,000 Machine hours 400,000 500,000 110,000 During January, the job cost sheets showed the following costs and production data. Department X Y Z Direct materials used $160,000 $126,000 $78;000 Direct labour costs $120,000 $110,000 $37,500 Manufacturing overhead incurred $89,000 $124,000 $74,000 Direct labour hours 8,000 12000 3,500 Machine hours 34,000 45,000 10,400 Instructions (a). Compute the predetermined overhead rate for each department. (2 marks) (b). Compute the total manufacturing costs assigned to jobs in January in each department. (2 marks) (c). Compute the under-or over applied overhead for each department at January 31. (1 mark)