Company: Merck & Co., Inc.

Merck & Co., Inc. disclosed its financial performance for the fiscal year ending December 31, 2023. The company reported total revenue of $70 billion, with a cost of goods sold (COGS) of $25 billion and operating expenses of $20 billion. Net income stood at $15 billion. Based on this information: a) Calculate the gross profit margin. b) Determine the operating profit margin. c) Compute the net profit margin. d) Evaluate the return on investment (ROI) if the company's total investment is $50 billion.