Encouraged by the Popularity of Your Dungeons and Dragons Website $R = - 80 x ^ { 2 } - 390 x$

Multiple Choice

Encouraged by the popularity of your Dungeons and Dragons website, www.mudbeast.net, you have decided to charge users who log on to the site. When you charged a $1.50 access fee, your web counter showed a demand of 270 "hits" per month. After you lowered the price to $0.50, activity increased to 350 "hits" per month. Obtain the monthly revenue R as a function of the access fee x.

A) $R = - 80 x ^ { 2 } - 390 x$
B) $R = 80 x ^ { 2 } - 230 x$
C) $R = - 80 x ^ { 2 } + 390 x$
D) $R = - 80 x + 390$
E) $R = 80 x - 230$