Answer:
b. $1,500
Step-by-step explanation:
Using the FIFO method, the first items in, should be the first items out.
Assuming that all one-carat diamonds are the same, even though the diamond sold was purchased on July 9, for inventory keeping using the FIFO method, this diamond should be valued at $1,500 since it is the value of the oldest item on stock.
Therefore, the cost of goods sold for the year is $1,500