Sophie Inc. is showing the following expected results for the sale of her dance book: Using the above information answer the following questions. What is the contribution margin ratio? HINT: remember the entry rules for percentages. A What is the break-even in sales dollars? What is the margin of safety in sales dollars? A What is the degree of operating leverage? Entry rules: enter your answer rounded to 2 decimal places. A If sales increase by 15%, by what percentage will the operating income increase? HINT: remember the entry rules for percentages AND remember to use your rounded answer for the degree of operating leverage that you just entered