Wolverine Company's average cost per unit is $1.425 at the 16,000-unit level of activity and $1.38 at the 20,000-unit level of activity. The selling price is $3.00 per unit.

Assume that all of the activity levels mentioned in this problem are within the relevant range.

Predict the following items for Wolverine Company:

Required:

1. Variable cost per unit.

2. Total fixed cost per period.

3. Total expected costs at the 18,000-unit level of activity.

4. Total Contribution Margin at the 18,000 unit level of production and sales.