In my opinion if I calculated correctly it should be 35 35 19 19
Mistake in line one
He forgot to factor the 2 out of -8x
→ You will pay $ 89.7.
The tip value is based on the bill value. Hence, to find the total payment you have to <u>multiply 78 by 1.15</u> (this includes the tip, 1.15).

Or you can <u>first find how many</u> 15% is from $78:

And then add this to $78:

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