QotD: A Tip About Tipping

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($amount / 10) + ($amount / 10 / 2)
($amount / 10) + (($amount / 10) / 2)
($amount / 10) * (1 + 1/2)
($amount / 10) * (3/2)
(3 * $amount) / 20

</dork>
heh, yay math. XD

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