In a study conducted in Pennsylvania, servers in various restaurants wrote “Thank you” on randomly selected bills before presenting the bills to their customers. Tips on these bills were an average of three percentage points higher than tips on bills without the message. Therefore, if all servers in Pennsylvania regularly wrote “Thank you” on restaurant bills, tips left in Pennsylvania would increase by about three percentage points, on average.
Which of the following is an assumption on which the argument relies?
A. No more than a small proportion of food servers in Pennsylvania currently write “Thank you” on restaurant bills.
B. Most patrons of Pennsylvania restaurants will notice the written “Thank you” on their bills.
C. The written “Thank you” reminds restaurant patrons that tips constitute a significant part of the income of many food servers.
D. The rate at which people tip food servers in Pennsylvania does not vary with how expensive a restaurant is.
E. The “Thank you” messages will have the same impact on regular restaurant patrons as they will on occasional patrons.
Solving this question helps.
Taking a timed set of similar questions in
GMAT Club Forum Quiz →
is even better.