Exercise 3 (20 points) A company sells 200+ units of a product every week where a belongs to the interval [10 100]. The fixed costs for buildings, machines and employees are $12,000-b a week with b in the interval [1,000; 20,000), while raw material and other variable costs are $50-ca unit with c in the interval [1; 10). (@) What is the profit if the selling price is $130 a unit? (b) What is the profit if the selling price is $80 a unit? (c) What is the profit if the selling price is fixed at S80 but sales rise to 450 units a week? Enach 3