(A) Find the stationary points for this function. (B) Using the first derivative test, find for what value of Q the profit maximised. (C) Find the feasible values of Q where the graph of the profit function is concave up.

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The profit of a firm is described by the following function: f(Q) = -8Q^3 + 30Q^2 – 120Q – 100 where Q is the quantity produced.

(A) Find the stationary points for this function.

(B) Using the first derivative test, find for what value of Q the profit maximised.

(C) Find the feasible values of Q where the graph of the profit function is concave up. 

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