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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 financial statements: What were Costco's revenues for fiscal year 2015? By what percentage did revenues grow from the prior year? What was Costco's operating income for the fiscal year? What was Costco's average tax rate for the year? What were Costco's diluted earnings per share in fiscal year 2015? What number of shares is this EPS based on? What were Costco's revenues for fiscal year 2015? Costco's revenues for fiscal year 2015 was million. (Round to the nearest million.) By what percentage did revenues grow from the prior year? The percentage the revenues grew from the prior year is %. (Round to two decimal places.) What was Costco's operating income for the fiscal year? Costco's operating income for 2015 was million. (Round to the nearest million.) What was Costco's average tax rate for the year? Costco's averag