For its fiscal year ending on June 30, 2018, Microsoft reported net income of $15.25 billion from sales of $113.31 billion. The company also reported total assets of $271.28 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 stockholders' equity of $85.99 billion and 7.52 billion shares of common stock outstanding.

(Round to two decimal places)