Financial Statement Analysis for Inventory Valuation Methods: A company uses both the FIFO (First-In-First-Out) and LIFO (Last-In-First-Out) inventory valuation methods. The company's inventory purchases and sales for the year were as follows:

Beginning inventory: 100 units at $10 per unit

Purchases: 200 units at $12 per unit

Sales: 250 units

Ending inventory: 50 units

Calculate the cost of goods sold and ending inventory under each inventory valuation method and discuss how the choice of inventory valuation method affects the company's financial statements and tax liabilities.