Compare and contrast the LIFO (Last-In, First-Out) and weighted average inventory valuation methods for Procter & Gamble Company. Procter & Gamble holds inventory with a cost of $1,000,000, consisting of 10,000 units acquired at different costs. Evaluate the impact of using LIFO and weighted average methods on the reported cost of goods sold, gross profit, and ending inventory value. Discuss the implications of inventory valuation methods on financial ratios and tax liabilities for Procter & Gamble.