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Superior Micro Products uses the weighted$-$average method in its process costing system. During January, the Delta Assembly Department completed its processing of $25,700$ units and transferred them to the next department. The cost of beginning work in process inventory and the costs added during January amounted to $$672,246$ in total. The ending work in process inventory in January consisted of $3,900$ units, which were $60\%$ complete with respect to materials and $40\%$ complete with respect to labor and overhead. The costs per equivalent unit for the month were as follows:

$\backslash$table$[[,$Materials,Labor,Overhead$],[$Cost per equivalent unit,$$12\mathrm{.}60,$$$4\mathrm{.}70,$$$7\mathrm{.}00$