Problem 7-7 A worker-machine operation was found to involve 3.1 minutes of machine time per cycle in the course of 40 cycles of stopwatch study. The worker’s time averaged 1.6 minutes per cycle, and the worker was given a rating of 106 percent (machine rating is 100 percent). Midway through the study, the worker took a 10-minute rest break. Assuming an allowance factor of 6 percent of work time which is applied only to the worker element (not the machine element), determine the standard time for this job. (Do not round intermediate calculations. Round your final answer to 2 decimal places.) Standard time minutes

Standard time = Normal machine time + Normal workers time (1+Allowance factor)

Normal machine time = 3.1 minutes

Normal workers time = (observed time*Performance rating)/100

Normal workers time = (1.6*106)/100 = 1.696 minutes

Standard time = 3.1 + 1.696*(1+0.06) = 4.90 minutes

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