(a)Using the Consolidated Statements of Income (or Operations),analyze the profitability of by preparing a common-size income statement for the past six years. In addition, calculate sales growth and operating expense growth for each two year period (2018 vs 2017, 2017 vs 2016 etc) presented, as well as effective tax rates for all years.

(b) Using the consolidated Statements of Stockholders' Equity, explain the key reasons for the changes in the common stock, accumulated other comprehensive income, and retained earnings accounts. Evaluate these changes.