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Determine the Labour Efficiency 3 points Operating Variance. The workers at Super Cleaning Service Bhd have a standard wage rate of RM9.00 per hour. At a virus quarantine centre, each worker is required to spend a standard 40 minutes to clean and sanitise each room. In May, 6 workers were hired to clean 55 rooms. Due to increased hygiene requirements, the company increased labour hour to 45 minutes. In addition, the wage rate per hour was raised by 15% to encourage workers to be more thorough with their cleaning work. The actual hours recorded in May was 165 hours. 0 RM742.5A O RM742.5 F O RM853.88 F O RM853.88 A A material mix variance 1 point occurs due to the difference between 0 the expected output and the actual output. arises due to differences between the 0 actual and expected blend of materials used for production 0 represents the total cost variance of all materials used 0 measures the efficiency of the I purchasing of raw materials