4. A work operation consisting of two elements has been subjected to a stopwatch time study. The recorded observations are shown in the following table. By union contract, the allowance time for the operation is; personal time: 5%; delay: 5% and fatigue: 10%. Determine the standard time for the work operation. Job Observations (minutes) Performance Element 1 2 3 4 5 6 Rating (%) A 0.1 0.3 0.2 0.9 0.2 0.1 90 B 0.6 0.8 0.5 110 (10 marks) 0.8 3.2 0.7