Answer:
c) $22
Step-by-step explanation:
Contribution margin per unit is how much a unit produced by a certain company is able to contribute to the payment of the fixed selling and administrative costs, comissions for sells to employees are also part of selling and administrative costs, so the only things that we have to withdraw from the selling price would be the manufacturing cost, which would be the variable cost: 40-18=22, so the contribution margin per unit would be $22 dollars.