For its fiscal year ending on June 30, 2018, Microsoft reported net income of $15.3315.33 billion from sales of $107.07107.07 billion. The company also reported total assets of

$230.53230.53 billion.

a. Calculate Microsoft's total asset turnover and its net profit margin.

b. Find the company's ROA, ROE, and book value per share, given that it has a total net stockolders' equity of $77.3177.31 billion and 4.024.02 billion shares of common stock outstanding.