Solve the Problem $p(x)=61-\frac{x}{6}$ , Then $x C D$ Will Be Sold $\mathrm{x} \mathrm{CDs}$

Multiple Choice

Solve the problem.
-The manager of a CD store has found that if the price of a CD is $p(x) =61-\frac{x}{6}$ , then $x C D$ will be sold. An expression for the total revenue from the sale of $\mathrm{x} \mathrm{CDs}$ is
$$R(x) =61 x-\frac{x^{2}}{6}$$
Find the number of CDs that will produce maximum revenue.

A) 223
B) 163
C) 183
D) 366