The mean demand of surgical units is $300$ units per month, the monthly standard deviation is $400$ units. A worker performs painting and shaping activities on a unit and takes $30$ and $35$ minutesrespectively in each task. During the painting activity the performance rating of the worker was $80\%,$ while in shaping it was $120\%.$ Determine the standard time it will take to do all activitieson a job.

$32\mathrm{.}5$ minutes

$65$ minutes

$66$ minutes

$55$ Minutes

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