Black Company uses the weighted$-$average method in its process costing system. The company's ending work$-$in$-$process inventory consists of $10,000$ units, $80\%$ complete with respect to materials and $50\%$ complete with respect to labour and overhead. If the total dollar value of the inventory is $$120,000$ and the cost per equivalent unit for labour and overhead is $$8\mathrm{.}00,$ what is the cost per equivalent unit for materials?