Solve the Problem $x$ Units of Cookbooks Is $P(x)=(8 x-5)(9 x-6)$ Find the Marginal Average Profit Function

Multiple Choice

Solve the problem.
-The total profit from selling $x$ units of cookbooks is $P(x) =(8 x-5) (9 x-6)$ . Find the marginal average profit function.

A) $72 x-93$
B) $72 x-30$
C) $72-\frac{30}{x^{2}}$
D) $72-\frac{93}{x^{2}}$