A manufacturing company, XYZ Corp, produces widgets. Calculate the cost of goods sold (COGS) for the quarter ending March, considering the following information:

1. 
   
   • Beginning Inventory on January 1st: 1,000 units at $10 each
   • Purchases during January: 2,000 units at $12 each
   • Purchases during February: 1,500 units at $14 each
   • Ending Inventory on March 31st: 800 units
   • Sales Revenue for the quarter: $150,000 Provide detailed calculations and explain the impact of inventory valuation methods (FIFO, LIFO, and Weighted Average) on COGS.