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  A manufacturing company, ABC Inc., purchases raw materials at varying costs throughout the accounting period. Using the specific identification method, calculate the cost of goods sold (COGS) for a specific sale transaction and determine the ending inventory balance. Consider the following transactions:

  Date	Description	Quantity	Cost/Unit ($)
  Jan 1	Beginning Inventory	100	10
  Feb 15	Purchase	200	12
  Mar 20	Sale	-150	-
  Dec 31	Ending Inventory	?	?

  Explain the rationale behind choosing the specific identification method and analyze its impact on COGS and ending inventory valuation for ABC Inc.