QS 25-24 Selection of sales mix LO A1 Excel Memory Company can sell all units of computer memory X and Y that it can produce, but it has limited production capacity. It can produce two units of X per hour or three units of Y per hour, and it has 4,050 production hours available. Contribution margin is $7 for product X and $6 for product Y. 1. Calculate contribution margin per production hour. Contribution Margin per Production Hour Product X Product Y Contribution margin per production hour