The marginal cost of producting $x$ tablet computers is
$$C'(x) = 110 - 0.04 x + 0.0002\ x^2$$ dollars.
What is the cost of producing $4000$ units if the setup cost is $70000$
Also
If the production is set at $4000$ units, what is the cost of producing $200$ additional units?
I'm not sure exactly what this question is asking, therefore i have no work.