Walmart Inc. reported the following financial information for the year ending December 31, 2023:

• Total Revenue: $350 billion
• Cost of Goods Sold (COGS): $200 billion
• Operating Expenses: $100 billion
• Other Income: $25 billion
• Tax Expense: $50 billion

a) Calculate the gross profit.

b) Determine the operating profit.

c) Compute the net profit before tax.

d) Calculate the net profit after tax, assuming a tax rate of 18%.