XYZ Retail Chain is conducting a comprehensive financial review:

• Compute Cost of Goods Sold (CGS) with beginning inventory valued at $1,000,000, purchases totaling $5,000,000, and ending inventory of $1,500,000.
• Evaluate SG&A expenses, including rent expenses of $200,000 and advertising costs amounting to $100,000.
• Calculate the Gross Profit Margin and propose measures to optimize inventory turnover by 20% through better procurement strategies.
• Analyze the financial impact of reduced inventory costs on working capital.