1. what is the revised net operating income if unit sales increase by 12%? 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 19%? 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 20%, variable expenses increase by 20 cents per unit, and the number of units sold decreases by 13%?