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C. Gugusan Bintang Sdn Bhd (GBSB) produces customized products and assigns manufacturing costs using normal costing system. From its inception, GBSB has been using plantwide overhead rate based on direct labour hours (DLH) to assign manufacturing overhead costs to customer orders. Recently, as the amount of its indirect costs getting larger, the accounting department of GBSB was considering two options - (1) to change the allocation base to machine hours; (2) to use departmental rate. If the latter is chosen, machining and assembly departments would use machine hours and direct labour hours respectively. The following details are collected from GBSB's 2019 production budget: Manufacturing overhead Direct labour costs Direct labour hours Machine hours Machining Department RM3,400,000 RM1,800,000 120,000 200,000 Assembly Department RM1,820,000 RM1,500,000 240,000 61,000 At the end of 2019, the actual manufacturing overhead costs were RM3,510,000 in Machining Department and RM2,125,000 in Assembly Department. Machine hours used by Machining Department is 215,000 whereas Assembly Department used 63,500 machine hours. REQUIRED: (a) Calculate the plantwide pre-determined overhead rate using the following bases: (1) Direct labour hours (1 Mark) (ii) Machine hours (1 Mark) (b) Discuss which of the two bases calculated at (a) would be a better basis for plantwide overhead rate. (2 Marks) C) Determine the departmental overhead rate for each department. (2 Marks) (d) Explain why departmental overhead rate would be a better option. (2 Marks) (e) Explain TWO (2) ways how overapplied or underapplied overhead being disposed. (2 Marks)

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