Final answer:
The Cost of Goods Sold for January 7 using the FIFO method and perpetual inventory system is $14.
Step-by-step explanation:
To calculate the Cost of Goods Sold using the FIFO method and perpetual inventory system, we need to determine the cost of the units sold on January 7. According to the FIFO method, the units sold will be the oldest units in inventory.
On January 5, 8 units were purchased at $14 each, making the total cost of $112. On January 7, 12 units were sold. Since there were only 11 units in inventory on January 1, the remaining 1 unit was from the purchase on January 5. Therefore, the Cost of Goods Sold for January 7 is $14.