please help me solve #4

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 11% ? 2. What is the revised net operating income if the selling price decreases by $1.30 per unit and the number of units sold increases by 17% ? 3. What is the revised net operating income if the selling price increases by $1.30 per unit. fixed expenses increase by $9,000, and the number of units sold decreases by 4% ? 4. What is the fevised net operating income if the selling price per unit increases by 20%, variable expenses increase by 40 cents per unit, and the number of units sold decreases by 5%