Hi

I am having trouble with this question and am not sure if i am doing it right.

C(x) = 480000 + 2.4x + 0.0008x^2

p(x) = 4 - 0.001x

a) What production level will minimize the average cost?

b) What level of sales will maximize the profits?

For a), I did A(x) = C(x)/x < Is that correct?

For b), I did P = p(x)(x) - C(x) < Is that correct?

Please tell me if I am making a mistake and how i should do it.

Thanks in advance.