(Consider each case independently): 1. What is the revised net operating income if unit sales increase by 20% ? 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 15%? 3. What is the revised net operating income if the selling price increases by $1.30 per unit, fixed expenses increase by $6,000, and the number of units sold decreases by 7% ? 4. What is the revised net operating income if the selling price per unit increases by 10%, variable expenses increase by 30 cents per unit, and the number of units sold decreases by 13%