A tip or gratuity is an amount of money that is given to a
worker such as a waiter or waitress who performs a service for
you. A common tip amount is 15% of the cost of the meal or other
service. Generally a tip is determined based on the total bill
which includes the cost of the meal and sales tax. If a meal
costs $10.00 and sales tax is 5% the bill is $10.50. A 15% tip
based on the $10.50 cost would be $1.58. The total would be
$10.50 + $1.58 = $12.08. In the next lesson we will find how to
quickly estimate the amount of a tip.