8 The company recorded $5,000 sales with 60% contribution margin ratio in 2019. According to the sales manager, the company can increase the sales volume by 30% this year if the company spends $400 as advertisement expense and decreases the selling price by 10%, while unit variable cost remains the same. If CEO approves the plan, how does it affect the net operating income in 2020? A $150 Decrease $250 Decrease $110 Increase $250 Increase $510 Increase