a group of 7 teenagers recently visited the japanese restaurant . the total bill for the meal , including 20 % gratuity , came to $ 840 . on average , how much did the meal of each individual cost before gratuity ?
n0 = 7.0
n1 = 20.0
n2 = 840.0
t0 = n2 / n1
t1 = t0 - n1
t2 = t1 - 10.0
answer = t2 - 2.0
print(answer)