can you please help me to solve this question step by step in detail. Thank you in advance.

Miller Company's contribution format income statement for the most recent month is shown below: Sales (43,000 units) Variable expenses Contribution margin Fixed expenses Net operating income Total $ 258,000 129,000 129,000 45,000 $ 84,000 Per Unit $ 6.00 3.00 $ 3.00 Required: (Consider each case independently): 1. What is the revised net operating income if unit sales increase by 17%? 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 21%? 3. What is the revised net operating income if the selling price increases by $1.40 per unit, fixed expenses increase by $7,000, 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 10%, variable expenses increase by 30 cents per unit, and the number of units sold decreases by 6%? 1. Net operating income 2. Net operating income 3. Net operating income 4. Net operating income