Answer: Sales price per unit less total variable cost per unit.
Explanation:
Cost-volume-profit analysis works by dividing the expenses faced by a business in the production and/ or selling of goods into fixed and variable costs.
To calculate the contribution margin in such a scenario, the Total variable cost incurred per unit is deducted from the sales price per unit. From this figure, the fixed cost can then be subtracted to find the operating income per unit.
If one wants to find the breakeven volume, you can divide the Fixed assets by the Contribution margin.