Assume the following (1) variable expenses = $320,000, (2) unit sales = 10,000, (3) the contribution margin ratio = 20%, and (4) net operating income = $10,000. Given these four assumptions, which of the following is true? Multiple Choice The total sales = $400,000 The variable expense ratio is 400% The total contribution margin = $256,000 The total fixed expenses = $64,000