Answer:
Increase by $6,000
Step-by-step explanation:
Calculation to determine the net operating income
Using this formula
Net operating income=Expected sales increase ×Contribution margin ratio-Fixed expenses
Let plug in the formula
Net operating income=$70,000 x 30% - $15,000
Net operating income=$21,000-$15,000
Net operating income=$6,000 increase
Therefore the net operating income will increase by $6,000