Hemels Pte Ltd (Hemels) manufactures two types of mattresses, Pheonix (a high-end product) and Dove (a low-end product). The entire mattress manufacturing process for either product has to go through two departments, namely Cutting and Gluing Department and Sewing Department. Each department involves various activities, such as purchasing, material handling, machine setup, quality control, and machine operation, etc. Pheonix and Dove require different levels of activities in the manufacturing process. Hemels uses direct labour hours and machine hours to assign the manufacturing overhead cost to Cutting and Gluing Department and Sewing Department, respectively. The direct labour rate is $10 per hour. The actual results reported by each department for the two products for the financial year ended 31 Januarv 2023 are as follows: Hemels manufactures 150 and 500 sets of Pheonix and Dove respecitvely during the financial year 2022/2023. The manufacturing overhead cost incurred by each of the two departments for the financial year 2022/2023 is per the estimated amount. Required (i) Determine the pre-determined overhead rates for (a) Cutting and Gluing Department; and (b) Sewing Department. (2 marks) (ii) Determine the total cost per unit of (a) Pheonix; and (b) Dove. (6 marks) (iii) Determine the manufacturing overhead variance and provide the journal entry to account for the manufacturing overhead variance. Assume the variance is insignificant. (3 marks) (iv) Is the existing overhead assignment method an Activity-Based Costing System or a Traditional Costing System? Support your answer with explanations. (4 marks) (TOTAL 15 marks)