Graham Corp.produces three products and selected data for each are shown below: Product A Product B Product Sales price per unit $120 $100 $105 Variable expense per 72 70 90 unit Contribution margin $48 $30 $15 Labour hours per 1.00 hr. 0.50hr. 0.20 hr. unit While there is demand for all products, labour hours are limited. Which product should Graham Corp. focus more of its limited labour hours on to generate the most profit? per unit