NOI for 1-4 please!

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 19% ? 2. What is the revised net operating income if the selling price decreases by $1.40 per unit and the number of units sold increases by 19% ? 3. What is the revised net operating income if the selling price increases by $1.40 per unit, fixed expenses increase by $6,000, and the number of units sold decreases by 4% 4. What is the revised net operating income if the selling price per unit increases by 20% variable expenses increase by 20 cents per unit, and the number of units sold decrease by 11%