The contribution format income statement for Huerra Company for last year is given below: Total Unit Sales $998,000 $49.90 Variable expenses 598,800 29.94 Contribution margin 399,200 19.96 Fixed expenses 321,200 16.06 Net operating income 78,000 3.90 Income taxes @ 40 % 31,200 1.56 Net operating income $46,800 $2.34 -------------------------------------------------------------------------------- The company had average operating assets of $509,000 during the year. As a result of a more intense effort by salespeople, sales are increased by 20%; operating assets remain unchanged. (Round interim calculations and final answers to 2 decimal places. Omit the "%" sign in your response.) Amount Effect Margin % (Click to select)UnchangedDecreaseIncrease Turnover (Click to select)DecreaseUnchangedIncrease Return on investment % (Click to select)UnchangedIncreaseDecrease