Carver Packing Company reports total contribution margin of $98,800 and pretax net income of $24700 for the current month. In the next month, the company expects sales volume to increase by 7%. The degree of operating leverage and the expected percent change in income, respectively, are O O 3.5 and 25% O 4.0 and 28% O 0.25 and 7% O 0.25 and 3.6% O 4.0 and 7%