Question 908464
The " eight " people is confusing- it just
means that it is a large group, I guess
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The $139.50 is the cost before the
gratuity and taxes ( I think ?? )
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They say the tax gets tacked on first
Cost of meal + tax = 
{{{ 139.5 + .06*139.5 }}}
{{{ 139.5 + 8.37 = 147.87 }}}
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Then the gratuity gets tacked on:
So is it 18% of the meal + tax ?
I think so. 
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{{{ 147.87 + .18*147.87 = 147.87 + 26.62 }}}
{{{ 147.87 + 26.62 = 174.49 }}}
The total bill is $174.49 
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You might want a 2nd opinion on this
I'm not 100% sure