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Percent of a number: tax, discount, and more

Erika ate brunch at a restaurant. The bill came to $12,20. If she left a 15% tip, how much was the tip? Write the percentage as a decimal. 15% = 0.15 Multiply the decimal by the amount of the bill. Multiply as you would multiply whole numbers, then write the decimal point in the answer. The tip was$1.83.

In a bicycle store, a $356 bicycle is marked, 'Get a 21% discount'. What is the discount? The discount is:$