Question

Suppose a manufacturer finds that its average weekly costs of production, C (in thousands of dollars), are a function of the number of units produced, x (in hundreds).

a. If C(x) = 0.002 x**3-0.6 x**2+800, then dC/dx at x =100 = -60

b. The number you entered above represents a marginal cost of $ ______ when 10000 units are produced.

Need help with b!