10. O'Brien, Inc's 2018 contribution margin income statement shows the following: Sales @ $8 per unit $160,000 Less Variable expenses ($128,000) Contribution margin $32,000 Less Fixed expenses ($44,000) Operating income (loss) ($12,000) 1 a. What is the unit contribution margin? 1.6 b. What is O'Brien Inc, 's break-even point in units? 27500 c. What if O'Brien Inc.'s advertising costs increased by $8,000, how much would they need to increase sales in order to break even? 11. What if O'Brien Inc.'s wanted to keep its advertising costs at $8,000 and they wanted to make a $6,000 profit, how many total units would they need to sell