Tesla Inc. is a renowned electric vehicle and clean energy company. For the year ended December 31, 2023, the company provides the following financial information:

• Total Revenue: $50 billion
• Cost of Revenue: $35 billion
• Selling, General, and Administrative Expenses (SG&A): $10 billion
• Research and Development Expenses (R&D): $8 billion
• Depreciation and Amortization: $2 billion
• Interest Expense: $500 million
• Income Tax Rate: 21% Calculate: a) Gross Profit Margin b) Operating Income Margin c) Net Income Margin d) Earnings per Share (EPS), assuming 1 billion outstanding shares.