Q7: Mixed costs are A) none of these. B) costs with both product and period elements. C) costs with both indirect and direct elements. D) costs with both fixed and variable elements. q8: Once the break-even point is reached, which of the following statements is true? A) The total contribution margin changes from negative to positive. B) The contribution margin ratio begins to decrease. Variable expenses will remain constant in total. D) Operating income will increase by the unit contribution margin for each additional item sold