Milford Manufacturing uses a process costing system with several production departments. In each department, all direct materials are placed into production at the beginning of the process, whereas conversion activity occurs uniformly throughout the period. At the start of the current period, Department B had $6,000$ units in beginning inventory that were $100\%$ complete with respect to materials and $60\%$ complete with respect to conversion. During the period, $18,000$ units were transferred into Department B from Department A$.$ At the end of the period, ending inventory in Department B was composed of $1,000$ units that were $100\%$ complete with respect to materials and $25\%$ complete with respect to conversion. Answer the following questions pertaining to Department B: $(1)$ The number of new units started and completed during the period was

units. $(2)$ The equivalent units transferred during the period totaled

equivalent units. $(3)$ The equivalent units of material used during the period totaled

equivalent units. $(4)$ Equivalent units of conversion used during the period totaled

equivalent units.