could you answer 1-4 with how to solve. im not for sure if 1 and 2 are right.

Miller Company's contribution format income statement for the most recent month is shown below: Required: (Consider each case independently): 1. What is the revised net operating income if unit sales increase by 17% ? 2. What is the revised net operating income if the selling price decreases by $1.50 per unit and the number of units sold increases by 22%? 3. What is the revised net operating income if the selling price increases by $1.50 per unit, fixed expenses increase by $8,000, and the number of units sold decreases by 3%? 4. What is the revised net operating income if the seilling price per unit increases by 20%, variable expenses increase by 30 cents per unit, and the number of units sold decreases by 6%