Answer:
Q = 450
P = 35
Explanation:
TR = P x Q = (75 - 0.1Q) x Q = -0.1Q2 + 75Q
Then, Cost = (30Q + 1,000)
Profit: Total revenue - C
-0.1q2 + 75Q - 30q - 1,000 = -0.1q2 + 45q - 1,000
as this is a quadratic function we identify a b c:
a= -0.1 b = 45 x = -1000
the profit maximum point is at the vertex:
-b/2a = -45/ 2(-0.1) = -45/-0.1 = 450
The profit maximize at Q = 450
P = 75 - 0.1x450 = 35