The price of lunch for 15 people was $207 including a 15% gratuity for service. What was the average price per person, EXCLUDING the gratuity?  Select the correct option
A) 11.73  B) 12  C) 13.8  D) 14  E) 15.87

Rationale: "x - > price without gratuity 207 = x + 0.15 x = > x = 207 / 1.15 = 180 so average price per person , excluding the gratuity = 180 / 15 = 12 the answer is b ."
Answer: B