1. what is the revised net operating income if unit sales increase by 15%? 2. what is the revised net operating income if the selling price decreases by $1.20 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 $1.20 per unit, fixed expenses increase by $5,000, and the number of units sold decreases by 2%? 4. what is the revised net operating income if the selling price per unit increases by 10%, variable expenses increase by 20 cents per unit, and the number of units sold decreases by 7%?