6 The Lakeside Company uses a weighted-average process costing system. The following data are available: Beginning inventory -0- Units started in production 22,500 01:21:16 Units finished during the period 18,000 Units in process at the end of the period (complete as to materials, 4,500 complete as to labor and overhead) Cost of materials used $39,200 Labor and overhead costs $40,400 Equivalent units of production for materials are: