Contribution Margin is equal to: O A. Sales - Fixed Costs - Variable Costs O B. Sales - Variable Costs O C. Fixed Costs + Variable Costs O D. Sales - Fixed Costs The break even point is all of the following except: O A. The point where sales - variable costs - fixed cost equals zero. O B. The point where net operating income is zero. C. The point where contribution margin equals. D. The point where contribution margin and fixed expenses are equal