In: Accounting
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A) FIFO Method:
| Date | Purchase | Sale | Ending Inventory | |
|---|---|---|---|---|
| Nov.1 | 8 units * $4 = $32 | |||
| Nov.4 | Purchase | 20 units * $4.50 = $90 | 8 units * $4 = $32 | |
| 20 units * $4.50 = $90 | ||||
| Nov.7 | Purchase | 20 units * $5 = $100 | 8 units * $4 = $32 | |
| 20 units * $4.50 = $90 | ||||
| 20 units * $5 = $100 | ||||
| Nov.10 | Sale | 8 units * $4 = $32 | 20 units * $4.50 = $90 | |
| 20 units * $5 = $100 | ||||
| Nov.12 | Sale | 20 units * $4.50 = $90 | 8 units * $5 = $40 | |
| 12 units * $5 = $60 | ||||
| Ending Inventory | 8 units * $5 = $40 | 
Ending Inventory under FIFO method is $40
Cost of Goods Sold = Begining Inventory + Purchases - Ending Inventory
= $32 + ($90 + $100) - $40
= $182
Cost of Goods Sold under FIFO method is $182
B) Weighted Average Cost Method is as follows:
Cost Per Unit = $32 + ($90 + $100) / 8 units + 20 units + 20 units
= $222/ 48 units
= $4.625 Per Unit
Ending Inventory = (8 units + 20 units + 20 units - 8 units + 32 units )
= 8 Units
Ending Inventory Cost = 8 Units * $4.625 Per Unit
= $37
Ending Inventory under Weighted Average Costmethod is $37
Cost of Goods Sold = Begining Inventory + Purchases - Ending Inventory
= $32 + ($90 + $100) - $37
= $185
Cost of Goods Sold under Weighted Average Cost method is $185