Answer:
a. $30,000
b. $126,000
Explanation:
a. Operating income = Northern operating income - Allocated common costs of eastern division
= $125,000 - $95,000
= $30,000
Here, we assume Eastern Division is dropped so we are deducting the allocated common cost from northern operating income.
b.
Sales $750,000
Less: Variable costs $270,000
Contribution margin $576,000
Less: Direct fixed costs $225,000
Segment margin $351,000
Less: Allocated common costs $225,000
Operating income $126,000
Therefore, if Northern divisions sales will increase by 20% so, we increase the contribution margin by 20%