The following data were extracted from the costing records of Bersatu Hati Production for September 2022. Salaries and wages Petrol and oil Insurance General expenses Raw material purchases Returns of defective raw materials Rental cost of special machine Additional information: i. Salaries and wages consist of: RM 250,000 11,308 21,400 93,460 79,020 4,020 5,000 60%-production workers RM60,000-production supervisors RM9,520 - Office administration Petrol and oil must be divided between production and administration departments in the ratio of 6:4. ii. iii. Insurance includes RM10,500 for the sales office. iv. General expenses - 35% for production, 65 % for non-production departments. Required: a) Compute prime cost and production overhead. (4 marks) b) Calculate the total product cost and period cost. (6 marks)