RST Airlines, a major player in the aviation industry, released its financial figures for the fiscal

year 2023. The company's total assets amounted to $10 billion, with total liabilities of $7 billion.

Its net income for the year stood at $500 million, and the shareholders' equity was $3 billion.

a) Determine the company's leverage ratio.

b) Calculate the company's debt ratio.

c) Find out the net profit margin of the company.

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