Which of the following is not an underlying assumption of cost-volume-profit analysis? Multiple Choice Selling price is constant Variable costs per unit are constant Net operating income is constant Totalved costs are constant within the relevant range ssume the following () Total sales - $121,000 (2) the contribution margin ratio 40%, and (3) total fixed expenses - SAS,000. Given these hree assumptions, the margin of safety is Multiple Choice $27,000 $105.000 $8.500 O $63,000