Delta Corporation is a retail company that operates several stores. The company's financial statements for the year ended December 31, 20X2, are as follows:

• Income Statement:
  • Sales Revenue: $2,000,000
  • Cost of Goods Sold: $800,000
  • Operating Expenses: $400,000
  • Net Income: $300,000
• Balance Sheet (at December 31, 20X2):
  • Total Assets: $1,500,000
  • Total Liabilities: $500,000
  • Equity: $1,000,000

Calculate the following financial ratios for Delta Corporation: Gross Profit Margin, Operating Profit Margin, Return on Assets (ROA), and Return on Equity (ROE). Interpret the ratios and provide insights into Delta Corporation's financial performance and efficiency.