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15 October, 17:17

The gratuity on a restaurant bill was $18. If a 20% tip was left, what was the original amount of the bill? To solve, use what equation?

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  1. 15 October, 20:42
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    Gratuity is the total tip given.

    The tip is directly proportional to total cost:

    18/0.20 = x/1.00

    $90
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