Question 4 20 pts Variable costs, within the relevant range: A. Differ on a per unit basis depending on how many units are sold. B. Decrease on a per unit basis as more units are sold. C. Increase on a per unit basis as more units are sold. D. Are the same per unit no matter how many units are sold. E. None of the above Question 5 20 pts The contribution income statement introduced in Chapter 7 highlights: A. Gross margin B. Product costs and period costs C. Different product lines D. Costs listed as variable or fixed costs E. All of the above are highlighted