Costco Wholesale Corporation, a major warehouse club retailer, disclosed its financial

performance for the year ending 2023. The company's total assets amounted to $150 billion,

with total liabilities of $100 billion. Its net income for the year stood at $15 billion, and the

shareholders' equity was $50 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.