Why is it sometimes misleading to compare a company's financial ratios with those of other firms that operate in the same industry?

Financial ratio analysis is conducted by managers, equity investors, long$-$term creditors, and short$-$term creditors. What is the primary emphasis of each of these groups in evaluating ratios?

If a firm's earnings per share grew from $$1$ to $$2$ over a $10$year period, the total growth would be $100\%,$ but the annual growth rate would be less than $10\%.$ True or false? Explain.

What is an opportunity cost rate? How is this rate used in discounted cash flow analysis, and where is it shown on a time line? Is the opportunity rate a single number that is used to evaluate all potential investments?