Presque Isle Seating Co., a manufacturer of chairs, had the following data for 2011: Sales 2,900 units Sales price $50 per unit Variable costs $20 per unit Fixed costs $18,420 Compute the following: (Do not round intermediate calculations. Round ratios to 2 decimal places e.g. 15.75% and all other answers to 0 decimal places, e.g. 125.) a. Contribution margin ratio % b. Break-even point in dollars $ c. Margin of safety in dollars $ Margin of safety ratio % d. If the company wishes to increase its total dollar contribution margin by 41% in 2012, by how much will it need to increase its sales if all other factors remain constant