How do I calculate a 20% tip?

Take the bill amount (e.g., $40). Move the decimal left one spot ($4.00) to get 10%. Double it ($8.00) to get 20%.

What is the standard US sales tax?

There is no national sales tax. It varies by state and city, usually ranging from 0% (Delaware, Oregon) to over 9% (parts of California, Tennessee).

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