SOLUTION: How do gratuity and tax relate to the part to whole proportion?

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Question 1097997: How do gratuity and tax relate to the part to whole proportion?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
The gratuity is based on the size of the bill. A fraction of the bill ADDED to the total cost. Tax works the same way but is a different fraction.

EXAMPLE:
Purchase product or service costing $100.
Customary gratuity rate, 20%
Local tax rate 9%,
Total cost including tax and tip: 100+20+9=129 dollars.