One very useful application of percent is mentally calculating a tip. Recall that to find 10% of a number, simply move the decimal point one place to the left. To find 20% of a number, just double 10% of the number. To find 15% of a number, find 10% and then add to that number half of the 10% amount. Mentally fill in the chart below. To do so, start by rounding the bill amount to the nearest dollar.
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Tipping Chart Bill Amount 10% 15% 20% $40.21 $15.89 $72.17 $9.33 Tipping Chart Bill Amount 10% 15% 20% $40.21 $15.89 $72.17 $9.33