4. Last year, Abby's Antiques reported $400,000 in sales and a net operating income when 10,000 units were sold. At break even point, the company's total contributic equals $300,000. Based on this information answer the following questions: of $50,000 on margin a) What is Abby's Antiques total contribution margin? b) How many units must be sold to earn a profit of $190,000