Company: Costco Wholesale Corporation

Costco Wholesale Corporation reported its financials for the fiscal year ending August 31, 2023. The company's total revenue was $200 billion, with a cost of goods sold (COGS) of $150 billion and operating expenses of $30 billion. Net income stood at $20 billion. Based on this information: a) Calculate the gross profit margin. b) Determine the operating profit margin. c) Compute the net profit margin. d) Analyze the return on equity (ROE) if shareholders' equity is $80 billion.