The monthly demand, x, of a compact disc is related to the price, p dollars per disc by the following equation:

p(x)=-0.0004x + 6

The total monthly cost for pressing and packaging x copies is given by

C(x)=600 + 2x - 0.0002x^2

A) What is the production level that minimizes the total cost?

B) What is the revenue function?

C) What is the profit function?

D) What is the production level that maximizes the profit?

Please try and show work if possible. I really need some help with this one. Thanks!