If materials are added when the production process begins and direct labor is apply uniformly throughout the process, what are the equivalent units for direct material for direct labor, respectively using the FIFO method of process costing? 16, 250; 19, 250. 16, 250; 21, 750. 21, 000; 22, 250. 19, 250; 18, 750. 21, 000; 19, 250