A project has fixed costs of $1,600 per year, depreciation charges of $500 a year, annual revenue of $9,300, variable costs equal to two-thirds of revenues and the tax rate is 20%. a. If sales increase by 10%, what will be the increase in pretax profits? Increase in pretax profits % b. What is the degree of operating leverage of this project? (Round your answer to 1 decimal place.) Degree of operating leverage times