Find online the annual 10-K report for Costco Wholesale Corporation (COST) for fiscal year 2015 (filed in October 2015). Answer the following questions from the income statement: a. What were Costco's revenues for 2015 ? By what percentage did revenues grow from the prior year? b. What were Costco's operating and net profit margins in 2015? How do they compare with its margins in the prior year? c. What were Costco's diluted earnings per share in 2015 ? What number of shares is this EPS based on?