A project has fixed costs of $2,100 per year, depreciation charges of $600 a year, annual revenue of $10,800, and variable costs equal to two-thirds of revenues.

a. If sales increase by 20%, 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.)

b. What is the degree of operating leverage of this project? (Do not round intermediate calculations. Round your answer to 2 decimal places.)