Please explain the solution to this financial accounting problem with accurate principles.

Delta Solutions prepared the following contribution format income statement based on a sales volume of 2,000 units (the relevant range of production is 1,000 units to 3,000 units): Description Amount Sales $50,000 Variable expenses $30,000 Contribution margin $20,000 Fixed expenses $12,000 Net operating income $8,000 What is the degree of operating leverage