South Corp. uses a FIFO process costing system in which direct materials are added at the beginning of the process and conversion costs are incurred uniformly throughout the process. Beginning inventory for January consisted of 1,000 units that were 40% completed. 10,000 units were started into the process during January. On January 31, the inventory consisted of 500 units that were 70% completed. How many units were started and completed during the period?