im not sure why 1 , 3 , 4 are wrong !

Exercise 6-13 (Algo) Changes in Selling Price, Sales Volume, Variable Cost per Unit, and Total Fixed Costs [LO6-1, LO6-4] Milier 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 174 ? 2. What is the revised net operating income if the selling price decreases by $1.30 pet unit and the number of units sold increases by 1996? 3. What is the revised net operating income if the selling price increases by $1,30 per unit, fixed expenses increase by $9,000, and the number of units sold decreases by 5% ? 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 8%