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15% is pretty standard. Take your total $20 and move the decimal place over once to the left. You get $2, which is 10%. Take the $2 and divide it by two and you'll get $1. Add the original $2 with the $1 which is $3. Your tip is $3, which is 15% of $20.

You can do this with any bill. Take the number, move the decimal over to the left. Take that amount, divide it by two, and add it to the original 10%.

Leaving a 20% tip is easier; take your bill, move the decimal point over once, and double that amount.

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