Merck & Co., Inc., a major pharmaceutical company, reported its financial figures for the year

ending 2023. The company's total assets amounted to $200 billion, with total liabilities of $120

billion. Its net income for the year stood at $20 billion, and the shareholders' equity was $80

billion.

a) Determine the company's debt-to-assets ratio.

b) Calculate the company's debt-to-equity ratio.

c) Find out the return on assets (ROA) percentage.

d) Calculate the return on equity (ROE) percentage.