John and Mary want to go to prom in style. They have contacted luxury limousines to determine the price. It will cost them $200 each to rent the limo for the evening,or $400 total. Since they had to spend so much on their outfits,they are running a little short on cash. They have decided since there is plenty of room in the limo,they will let other join them,if they share equally in the cost. How will including others affect the cost per student?

How many more students will use that limo's services?