Superior Micro Products uses the weighted$-$average method of process costing. During January, the Assembly Department completed its processing of $25,600$ units and transferred them to the next department. The cost of beginning work in process inventory and the costs added during January totaled $$706,840.$ The ending work in process inventory in January consisted of $3,300$ units, which were $70\%$ complete for materials and $50\%$ complete for labor and overhead. The costs per equivalent unit for the month were as follows:

$\backslash$table$[[,$Materials,Labor,Overhead$],[$Cost per equivalent unit,$$14\mathrm{.}00,$$$5\mathrm{.}20,$$$6\mathrm{.}40$