Answer:
Option C is correct P(q) = -0.005q^{2} Â + 2.25q - 100 Â
Explanation:
Profit P(q) = R(q) – C(q)
Profit = Revenue – Cost
So, Â
P(q) = -0.005q^{2}  + 2.5q - 100 – 0.25q
P(q) = -0.005q^{2} Â + 2.25q - 100 Â
In order to find break even, you should plug 50 and 400 into the formula P(q) = -0.005q^{2} Â + 2.25q - 100 Â