Company: IBM (International Business Machines Corporation)

IBM reported its financials for the fiscal year ending December 31, 2023. The company's total revenue was $80 billion, with a cost of goods sold (COGS) of $30 billion and operating expenses of $25 billion. Net income amounted to $15 billion. Based on this data: a) Calculate the gross profit margin. b) Determine the operating profit margin. c) Compute the net profit margin. d) Assess the return on equity (ROE) if shareholders' equity is $50 billion.