Answer:
D. $137
Explanation:
Using FIFO method, that is first in, first out
After Sale on October 8 we have 7 unit left in the inventory which cost $77
A new purchase was made for 15 units at $12 per unit on October 20, totaling current inventory in unit to 21 unit.
Therefore
Sale on October 25 of 12 unit
= 7 units at $77 + 5 units at $(5 × 12)
= 77 + 60
= $137