Therefore, the correct answer is indeed A.
.
Let's go through the solution step by step to verify the correct answer:
The given cost function is
.
The given revenue function is

The profit function,
, is the difference between the revenue function and the cost function:
![\[P(x) = R(x) - C(x)\]](https://img.qammunity.org/2024/formulas/mathematics/high-school/ggs0g8y15a0kpqnh44wi8orjezvnq0jw1q.png)
Substitute the expressions for
and
into the profit function:
![\[P(x) = (-0.62\% + 900x^2 - 400x + 700) - (400x^2 + 3003)\]](https://img.qammunity.org/2024/formulas/mathematics/high-school/ttnao8s1ymi87rquybtmu8lamna39uxswb.png)
Now, simplify the expression:
![\[P(x) = -0.62\% + 500x^2 - 400x - 2303\]](https://img.qammunity.org/2024/formulas/mathematics/high-school/ripton7lykaiog7pi6bo1nwokvyy1y6jku.png)
So, the correct profit function is
.
Comparing this with the provided answer choices:
A.
(This matches the correct answer)
B.
(This is not the correct answer)
C.
(This is not the correct answer)
D.
(This is not the correct answer)
Therefore, the correct answer is indeed A.
.