help with #4 please and show how you got it

Exercise 6-13 (Algo) Changes in Selling Price, Sales Volume, Variable Co jer Unit, and Total Fixed Costs [LO6-1, LO6-4] Milier Compony's contribution format income statement for the most recent monti, shown beli Required: (Consider each case independently): 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 $1.40 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 $1.40 per unit, fixed expenses increase by $10,000, and the number of units soid decreases by 6% ? 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 6%