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Take 80% of 500 and you get 400
20% of 308 = 308*20/100 = 61.6
quick way to estimate a 10 percent tip is to remove the ones digit.Example: to give 10% tip for 50 = 510% tip for 500 = 50
10 percent of 500 = 5010% of 500= 0.10 * 500= 50
2.9% of 500 = 2.9% * 500 = 0.029 * 500 = 14.5