The manager of Dukey's Shoe Station estimates operating costs for the year will include $465,000 in fixed costs. Required: a. Find the break even point in sales dollars with a contribution margin ratio of 40 percent. b. Find the break-even point in sales dollars with a contribution margin ratio of 20 percent. c. Find the sales dollars required to generate a profit of $150,000 for the year assuming a contribution margin ratio of 40 percent