Assume a company makes only three products, A, B, and C: Product A Product B Selling price per unit Variable cost per unit $ 80 $ 65 Product C $ 45 $ 35 $ 25 $ 20 Machine-hours per unit 2.5 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: