Answer:
=$100,000
Explanation:
Contribution margin equals to sales - variable cost.
It means the contribution margin has accounted for variable costs.
The total contribution margin, in this case, will be contribution margin per item multiplied by total units sold.
=40,000 units x 4
=$160,000
Operating income = Total contribution margin - fixed costs
=$160,000 - $60,000
=$100,000