carver packing company reports total contribution margin of $98,800 and income of $24,700 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: multiple choice 3.5 and 25% 0.25 and 7% 0.25 and 3.6% 4.0 and 7% 4.0 and 28%