Company: Amazon.com, Inc.

Amazon.com, Inc. reported its financial performance for the fiscal year ending December 31, 2023. The company recorded total revenue of $400 billion, with a cost of goods sold (COGS) of $250 billion and operating expenses of $100 billion. Net income amounted to $30 billion. Based on this information: 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 $200 billion.