Answer:
The following data is missing in the question which is being reproduced;
Selling price $140
Variable Cost $28
Contribution Margin $112
Step-by-step explanation:
Increase in sale 180*140 $25,200
Variable Cost 180*28 ($5,040)
Net contribution margin $20,160
Advertising expense-incremental ($20,000)
Net Increase in operating income $160
The net operating income will increase with just $160 because of this change.