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May 13, 2010Mental Math Secrets - Ep2 - Calculate 15 Percent Tip9 minutesPlayLearn to rapidly calculate restaurant tips in your head!...moreShareView all episodesBy nerfherderMay 13, 2010Mental Math Secrets - Ep2 - Calculate 15 Percent Tip9 minutesPlayLearn to rapidly calculate restaurant tips in your head!...more
May 13, 2010Mental Math Secrets - Ep2 - Calculate 15 Percent Tip9 minutesPlayLearn to rapidly calculate restaurant tips in your head!...more