Walmart Inc. provided the following financial data for the month of April 2024:

• Total sales revenue: $3,000,000
• Sales returns: $100,000
• Sales discounts: $50,000
• Cost of goods sold: $1,800,000
• Operating expenses: $700,000
• Other expenses: $100,000
• Income tax expense: $200,000

Calculate the net sales, gross margin, operating income, and net income for Walmart Inc. for April 2024.