Assume a company makes only three products, A, B, and C: Selling price per unit Product A $ 90 Product B $ 65 Product C $ 45 Variable cost per unit $ 35 $ 25 $ 20 Machine-hours per unit 3.00 3 1.5 The company does not have enough machine-hours available to satisfy demand for all of its products. Product A's contribution margin per unit of the constraining resource is closest to: