Assume the following (1) variable expenses =$280,000,(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 frod expenses =$56,000 The total soles =$336,000 The break-even point in sales doliars is $300000 The total contribution margin =$224,000