the bottom right number in contrabution margin is 80% its kinda hard to see

Naumann Corporation produces and sells a single product Data concerning that product appear below Per Unit Selling price Variable expenses Contribution margin $ 200 40 $ 160 Percent of Sales 1945 20% 80% Fixed expenses are $120.000 per month. The company is currently selling 1300 units per month Required: Management is considering using a new component that would increase the unit variable cost by 549. Since the new component would improve the company's product, the marketing manager predicts that monthly sales would increase y 500 unts. What should be the overall effect on the company's monthly net operating income of this change if fixed expenses are unaffected? (Negative amounts should be indicated by a minus sign.) Change in net operating income