6-4. Been Broke Incorporated's income statement for the most recent month is given below. Total Store P Store Sales $600,000 $200,000 $400,000 Variable expenses. 38-4,000 144.000 240.000 Contribution margin 216,000 56,000 160,000 Traceable fixed expenses........ 152.000 42.000 110,000 Segment margin.. 64,000 S 14,000 S 50,000 Common fixed expenses 34.000 Net operating income.............. S 30.000 The marketing department believes that a promotional campaign at Store P costing $6,000 will increase sales by $30,000. If the campaign is adopted, overall company net operating income should: 1. Increase by $2,400 2. Decrease by $2,400 3. Increase by $8,400 4. Increase by $24,000