The manager of Dukey's Shoe Station estimates operating costs for the year will include $435,000 in fixed costs. Required: a. Find the break-even point in sales dollars with a contribution margin ratio of 50 percent. b. Find the break-even point in sales dollars with a contribution margin ratio of 30 percent. c. Find the sales dollars required to generate a profit of $300.000 for the year assuming a contribution margin ratio of 50 percent