Take the dollar amount on the check and multiply it by 0.15. For example, if the check was $17.5, then the tip would be $17.5 * 0.15 or $2.625, or $2.63, which most people would give $2.75 or even $3.
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15 percent tip for 66.60 = 9.9915% of 66.60= 0.15 * 66.60= 9.99
2.43
$1.48
$6.40
the answer is 48