Walmart Inc. operates a chain of retail stores. For the year ended December 31, 20X6, the company reported the following information:

• Total revenue: $90,000,000
• Cost of goods sold: $40,000,000
• Selling and administrative expenses: $20,000,000
• Other operating expenses: $15,000,000
• Income tax expense: $15,000,000 Calculate the company's net income, gross profit margin, operating income, and net profit margin.