The following table shows a four$-$step process. The necessary time for one worker to perform each task on one unit is listed as well as the number of workers at each step. Available materials are limited to the amount sufficient for $6\mathrm{.}7$ units per hour and average hourly demand is $7\mathrm{.}8$ units.

What is the utilization of Step $2?($use decimal format$)$

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