Solve
-The Manufacturer of a CD Player Has Found That $\mathrm { P } C D$

Multiple Choice

Solve.
-The manufacturer of a CD player has found that the revenue function for selling $\mathrm { P } C D$ players is $R ( p ) = - 5 p ^ { 2 } + 1560 p$ . Find the maximum revenue to the nearest whole dollar.

A) $\$ 121,680$
B) $\$ 973,440$
C) $\$ 486,720$
D) $\$ 243,360$