I need help with this one

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 15% ? 2. What is the revised net operating income if the sellinglorice decreases by $1.50 per unit and the number of units sold increases by 25% ? 3. What is the revised net operating income if the selling price increases by $1.50 per unit, fixed expenses increase by $20,000, and the number of units sold decreases by 5% ? 4. What is the revised net operating income if the selling price per unit increases by 12%, variable expenses increase by 60 cents per unit, and the number of units sold decreases by 10%