If the marginal costs of each removal method are, respectively, $10q1, $5q2, and $2.5q3, how much of each method should you use to achieve the removal cost-effectively?

b. Why isn’t an exclusive use of method 3 cost-effective?

c. Suppose that the three marginal costs were constant (not increasing as in the previous case) such that MC1 = $10, MC2 = $5, and MC3 = $2.5. What is the cost-effective outcome in that case?