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Explain how you could use mental math to find a 15% tip for a $26 restaurant bill.
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Explain how you could use mental math to find a 15% tip for a $26 restaurant bill.

User Abul Hasnat
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10% of 26 is 2.60. Now, half of that is 1.30. Add both of them and you get 3.90. Same logic can work for a 20% tip, just double to 10%.
User Ettozyame
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