The price of lunch for 15 people was 207 pounds, including a 15 percent…

Option 3:

Let the net price excluding the gratuity of service = x pounds

Then. total price including 15% gratuity of service = x + 0.15 x = 1.15 x pounds.

So. 1.15 x = 207 pounds

. => x = 207 / 1.15 = 180 pounds

Net price of lunch for each person = 180 / 15 = 12 pounds