U.S. Steal has the following income statement data: Total Units Variable Sold Costs 90,000 $270,000 110,000 Fixed Costs 330,000 $ 80,000 B0,000 Total Costs $ 350,000 410,000 Total Revenue $ 450,000 550,000 Operating Income (Loss) $ 100,000 140,000 The top row of the table has the beginning values and the bottom row of the table has the ending values. a. Compute the degree of operating leverage (DOL) based on the formula below. (Do not round intermediate calculations your final answer to 2 decimal places.) Percent change in operating income. DOL Percent change in units sold Degree of operating leverage