A work operation consisting of three 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.

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OBSERVATIONS (MINUTES) JOB ELEMENT PERFORMANCE 1 2 3 4 5 6 RATING (%) A .1 B .8 C .5 365 .2 .8 Sn 5 284 .9 6 .2 .1 90 .5 3.2 .7 110 .5 .6 .5 80