Answer: b. 8,101 units
Step-by-step explanation:
When using the FIFO method to cost inventories, the number of equivalent units for production takes into account the beginning inventory.
It is calculated as:
= (Beginning inventory * (1 - completion rate) ) + (Units completed - Opening inventory) + (Ending inventory * Completion rate)
= (500 * ( 1 - 68%)) + (8,000 - 500) + (900 * 49%)
= 160 + 7,500 + 441
= 8,101 units