DEF Pharmaceuticals, a global healthcare company, disclosed its financial performance for the

year ending 2023. The company's total assets amounted to $1.2 trillion, with total liabilities of

$800 billion. Its net income for the year was $60 billion, and the shareholders' equity stood at

$400 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.