6. Duve Corporation has provided the following contribution format income statement Assume that the following information is within the relevant range. Sales (2,000 units) Variable expenses S 40,000 24,000 16,000 Contribution margin Fixed expenses Net operating income If the selling price increases by $4 per unit and the sales volume decreases by 200 units, the net operating income would be closest to: A) $7,200 B) $12,800 C) $10,400 D) S11,520