I need help with questions 3 & 4

Marquette Manufacturing produces "invisible" electric dog fences, sold through retail locations nationwide. The selling price of the fence is $150 per unit. The cost to manufacture and market the fences is shown below. These figures represent the cost at the company's normal volume of 3,000 units per month.

(NOTE: Unless otherwise stated, assume that no connection exists between the situation described in each question; each is independent. Also, ignore taxes or other costs not specifically mentioned in the questions.)

Unit Manufacturing Costs Variable materials $ 15.00 Variable labor $ 17.50 Variable overhead $ 12.50 Fixed overhead $ 16.00 Total unit manufacturing costs $ 61.00 Unit Marketing Costs Variable $ 12.00 Fixed overhead $ 17.00 Total unit marketing costs $ 29.00 Total unit costs $ 90.00