A certain NYC taxi driver has decided to start charging a rate of r cents per person per mile. How much, in dollars, would it cost 10 people to travel x miles if he decides to give them a 50% discount?  Answers:
A) 3xr/2 B) 3x/200r C) 3r/200x D) 3xr/200 E) xr/20
10xr/2 is in cents - 10xr/200 dollars = xr/20   Answer : xr/20
<result>E</result>
A certain NYC taxi driver has decided to start charging a rate of r cents per person per mile. How much, in dollars, would it cost 10 people to travel x miles if he decides to give them a 50% discount?