This is part 3 of my assinfment and the only part i need help with. I will post part 1 and 2 so you can understand the whole assignment// if there is information in the previous parts that you need. thanks!

part 1 & 2- supporting information from the assignment:

part 1;

part 2;

Stonebraker Corporation has provided the following contribution format income statement: Sales Variable expenses Contribution margin Fixed expenses Net operating income $270,000 189,000 81,000 77,400 3,600 Required for Section Three: Note lach of these requirements is trdependent of the other two-teguirements. 1. If sales increase to 9,040 units, what would be the estimated increase in net operating income? 2. If the variable cost per unit increased by $6, spending on advertising increased by $3,000 and unit sales increase by 19,200 units, what would be the estimated net operating income? 3. Estimate how many units must be sold to achieve a target profit of $26,100. A partial list of costs at Brooks Corporation appears below: Factory supplies Administrative wages and salaries Direct materials Sales staff salaries Factory depreciation Corporate headquarters building rent Indirect labor Marketing Direct labor $9,000 85,000 126,000 30,000 33,000 43,000 26,000 65,000 99,000 Required for Section One: 1. What is the amount of total product costs