57 Question: Prime cost A service for a sports car requires 3 hours of a skilled mechanic's time followed by 1/2 hour of unskilled labour. Rates of pay are (a) Skilled: 9 per hour (b) Unskilled: 5 per hour Oil, oil filter, screen wash and spark plugs cost 6.90 in total. Rent and rates for the industrial unit from which the service centre operates, work out at 4 per hour. Administration costs are 2 per service. The prime cost of the service is A 29.50 B 36.40 C 50.40 D 52.40 [57