The original amount of the bill is $90.
Given that, the gratuity on a restaurant bill = $18 and tip = 20%.
We need to find the original amount of the bill.
A gratuity is a sum of money customarily given by a customer to certain service sector workers such as hospitality for the service they have performed, in addition to the basic price of the service.
The tip is directly proportional to the total cost
[tex]=\frac{18}{0.20} =x[/tex]
= $90
Therefore, the original amount of the bill is $90.
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