The Total Revenue $\ {R }$ Earned Per Day (In Dollars) from a Pet-Sitting Service Is

Multiple Choice

The total revenue $\ {R }$ earned per day (in dollars) from a pet-sitting service is given by $R ( p ) = - 12 p ^ { 2 } + 150 p$ where, $p$ is the price charged per pet (in dollars) . Find the revenue when the price per pet is $\$ 9$ .

A) $\$ 398$
B) $\$ 388$
C) $\$ 418$
D) $\$ 408$
E) $\$ 378$