Winthrop Manufacturing produces a product that sells for $50.00. Fixed costs are $260,000 and variable costs are $24.00 per unit. Winthrop can buy a new production machine that will increase fixed costs by $11,400 per year, but will decrease variable costs by $3.50 per unit. Compute the contribution margin per unit if the machine is purchased. A. $28.50. B. $22.50. C. $27.50. D. $26.00. E. $29.50