The following is last month's contribution format income statement: Sales [15,000 Units) $375,000 Less: Variable Expenses . Contribution Margin $150,000 Less: Fixed Expenses m, Operating Income m. Using the degree of operating leverage concept! if the company's sales increase next year by 8%! by what percentage can its operating income expect to increase {within the relevant range)? .5 j. 60% {rt} 36% .5 j. 12% {rt} 24%