Answer:
$42.84
Step-by-step explanation:
There are two ways to do this.
One
19% of 36 = 19/100 * 36 = $6.84
Total 36 + 6.84 = $42.84
Two
The second method involves knowing that his total is going to wind up being 119% of the bill. That's 100% + 19%
So the equation look like this
(119/100) * 36
or
(119 * 36) / 100 = 4284 / 100 = $42.84
Note
Both methods give you the same answer.