Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
-The price $p$ and the quantity $x$ sold of a certain product obey the demand equation:
$$p = - \frac { 1 } { 5 } x + 200 , \{ x \mid 0 \leq x \leq 500 \}$$
What is the revenue to the nearest dollar when 300 units are sold?

A) $\$ 110,000$
B) $\$ 78,000$
C) $\$ 20,000$
D) $\$ 42,000$