Please check my work:

Andretti Company has a single product called a Dak. The company normally produces and sells 81,000 Daks each year at a selling price of $40 per unit. The company's unit costs at this level of activity are given below:

Direct materials$9.50Direct labor8.00Variable manufacturing overhead2.40Fixed manufacturing overhead4.00($324,000 total)Variable selling expenses3.70Fixed selling expenses3.50($283,500 total)Total cost per unit$31.10

A number of questions relating to the production and sale of Daks follow. Each question is independent.

1-a. Assume that Andretti Company has sufficient capacity to produce 113,400 Daks each year without any increase in fixed manufacturing overhead costs. The company could increase its sales by 40% above the present 81,000 units each year if it were willing to increase the fixed selling expenses by $110,000. Calculate the incremental net operating income.(Round your answers to the nearest whole number.)

Answer: 247,860

1-b. Would the increased fixed selling expenses be justified? Yes

2. Assume again that Andretti Company has sufficient capacity to produce 113,400 Daks each year. A customer in a foreign market wants to purchase 32,400 Daks. Import duties on the Daks would be $1.70per unit, and costs for permits and licenses would be $19,440. The only selling costs that would be associated with the order would be $2.20 per unit shipping cost. Compute the per unit break-even price on this order.(Round your answers to 2 decimal places.)

24.40 = break even price per unit

3. The company has 700 Daks on hand that have some irregularities and are therefore considered to be "seconds." Due to the irregularities, it will be impossible to sell these units at the normal price through regular distribution channels. What unit cost figure is relevant for setting a minimum selling price?(Round your answer to 2 decimal places.)

Answer: $1.70

4. Due to a strike in its supplier's plant, Andretti Company is unable to purchase more material for the production of Daks. The strike is expected to last for two months. Andretti Company has enough material on hand to operate at 25% of normal levels for the two-month period. As an alternative, Andretti could close its plant down entirely for the two months. If the plant were closed, fixed manufacturing overhead costs would continue at 35% of their normal level during the two-month period and the fixed selling expenses would be reduced by 20%. What would be the impact on profits of closing the plant for the two-month period?(Any losses should be indicated by a minus sign. Round all calculations (intermediate and final) to whole numbers. Round unit calculations to whole numbers.)

Answer: net disadvantage = $74,250