With FIFO, it is easy you can just take all inventory + purchases and take the beginning for your sales. You started with - 100 @ 22 Then it became - 100 @ 22 - 40 @ 25 - 70 @ 30 - 100 @ 28 With FIFO you tap on the oldest first then your sold items are: - 50 of the first 100 - 100 becomes 50 of the first 100, 40 of the ones at 25 and 10 of the ones at 30 - 35 is still picked at 30. That gives you: - 100 x 22 + 40 x 25 + 45 x 30 = 4550 Computing the COGS with FIFO is easy because the order is irrelevant, you always pick from the oldest inventory.
I think you should draw the inventory step by step. The FIFO means that you take from the oldest inventory. I kind of explained the 45 but I will add more details, it is important you understand the mechanism of FIFO.
You start with
100@22
Then you buy 40@25, your situation is now:
COGS = 40 x 25
Inventory is:
100@20
40@25
You sell 50, then your situation is:
COGS = 50 x 20
Inventory
50@20
40@25
You purchase 70@30, your situation is:
COGS = 50 x 20
Inventory
50@20
40@25
70@30
You sell 100@ 32, the 100 are taken from the oldest inventory this is why:
COGS = 50 x 20 + 50 x20 + 40 x 25 +10 x 30
Inventory
60@30
You sell 35@ 32, the 100 are taken from the oldest inventory this is why:
COGS = 50 x 20 + 50 x20 + 40 x 25 +10 x 30 + 35 x 30
Inventory
25@30
The last step does not matter for COGS.
As you can see, the results is exactly the same for FIFO if you collapse all purchases first because order does not matter for FIFO. This is helpful if you need to save some time for the exam.
If you collapse all results, you draw the inventory after all purchases, then notice that you sell 185, you directly pick it from the inventory from the top and it is much faster.
This was extremely helpful. The one example in the CFA book was not really enough to help me understand this concept–me anyway. I thought this was one of the toughest sections thus far made moreso by knowing how crucial an area it is both for the exam and for finance in general.
Glad I could help. I attended the exam in December. If I had only 1 advice to give, it would be to start with the topics you find the hardest first . For me it was FRA, the second advice I have is to try to understand the bigger picture rather than learning by heart.
if you understand fully FRA it significantly reduce the number of things you need to know by heart and you can deduce many results from your knowledge meaning that it will stick for longer.
i tried to learn by heart and it was really rough and tough, I hope I passed though.