What is the net operating income if have decrease in selling price of 20%, increase of 30% in sales and increase in advertising of $10,000. Total Per Unit Sales (1,000 Units) $120,000 $120 Variable Expenses 70,000 70 Contribution Margin 50,000 $50 Fixed Expenses 20,000 Net Operating Income 30,000 $4,100 $4,000 $3,800