In a construction project, a stone cladding activity is planned to be carried out. The stone quantity is estimated to be around $2152$ m$2.$ The foreseen productivity for a stone mason and a helper is around $17$ m$2/$day $(8$ hours per day$).$ The contracting company pays the stone mason a rate of $21$ $$/$hour$,$ while it pays the helper a rate of $12$ $$/$hour$.$ It also pays each one of them $6$ $$/$day against transportation cost, and each one of them is covered by a health insurance which costs the company around $91$ $$/$week$.$ Both labors will work $8$ hours per day, $5$ days a week.

Based on the given information, answer the given questions below:

Find the direct labor unit cost?