Refer to the Following:
the Market Demand for a Monopoly $Q _ { d } = 100,000 - 500 P + 2 M + 5000 P _ { R }$

Refer to the following:
The market demand for a monopoly firm is estimated to be:
$Q _ { d } = 100,000 - 500 P + 2 M + 5000 P _ { R }$
where
$Q _ { d }$ is quantity demanded, P is price, M is income, and
$P _ { R }$ is the price of a related good. The manager has forecasted the values of M and
$P _ { R }$ will be $50,000 and $20, respectively, in 2015.
-For 2015, the forecasted demand function is

A) $Q _ { d }$ = 300,000 - 500P
B) $Q _ { d }$ = 100,000- 100P
C) $Q _ { d }$ = 600,000 - 100P
D) $Q _ { d }$ = 200,000 -500P
E) none of the above