please show work for following problems:A firm has $100 of average inventory, operating profit

please show work for following problems:

A firm has $100 of average inventory, operating profit

of $500 and sales of $1,500. What will be its days in inventory?

• 36.5 days
• 24.3 days
• 73.0 days
• Not enough information

Which of the following assumptions regarding investor behavior are required by the CAPM? 

     I. Investors try to maximize their wealth 

     II. Investors consider only risk when making investments 

     III. Investors are risk averse 

     IV. Investors adopt a long-term perspective