What is a good tip for $100?

Calculating a Convenient 20% Tip on a $100 Bill

When dining out, it’s customary to show appreciation for the service by offering a tip. For a 20% tip, the math can seem daunting, but there’s a quick and easy trick to simplify the calculation.

The Double and Shift Method

To calculate a 20% tip on a $100 bill, follow these steps:

1. Mentally Double the Amount: Multiply $100 by 2 to get $200.
2. Shift the Decimal: Move the decimal point in $200 one place to the left, resulting in $20.

Voila! You’ve now effortlessly calculated the 20% tip, which is $20.

Why it Works

This trick relies on the fact that a 20% tip is equivalent to half of 10%. By doubling the amount and shifting the decimal, you essentially divide it by 2, effectively calculating a 10% tip, which is then doubled to yield the 20% tip.

Benefits

This method is particularly useful in situations where a calculator is not readily available, such as during a meal. It’s also quick and easy to remember, making it a convenient tool for service industry professionals and patrons alike.

Conclusion

Next time you’re facing a $100 bill and need to calculate a 20% tip, remember the double and shift method. It’s a simple and efficient trick that can help you leave a fair and generous tip without breaking a sweat.