Originally posted by muses_nightmare
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Say you had a nice meal. It's bill total is $32.81.
Drop that penny, and move the decimal over one point, so it's now
$3.28. This is ten percent. To make it tweny percent, you just add it again.
$3.28 + $3.28 is $6.56. Which is a twenty percent tip for $32.81.
Hope that helps.
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