Inventory Valuation  

Date	Transaction Description	Units Purchased	Unit Cost ($)	Units Sold	Unit Selling Price ($)
Jan 1	Beginning Inventory	100	10
Jan 5	Purchase	50	12
Jan 10	Sale			80	20
Jan 20	Purchase	30	11
Jan 25	Sale			40	22

Tasks:

1. Calculate COGS and ending inventory using FIFO.
2. Calculate COGS and ending inventory using LIFO.
3. Calculate COGS and ending inventory using the weighted average method.

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