A project has fixed costs of $700 per year, depreciation charges of $200 a year, annual revenue of $4,500, and variable costs equal to two-thirds of revenues. a. If sales increase by 11%, what will be the percentage increase in pretax profits? (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.) Pretax profit increase % b. What is the degree of operating leverage of this project? (Do not round intermediate calculations. Round your answer to 2 decimal places.) Degree of operating leverage