# 10 Everyday Things You're Probably Doing the Hard Way

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## How Often Should You Wash Your Coffee Cup?

HowStuffWorks finds out how often you should wash your coffee cup or mug to avoid germs.

### Author's Note: 10 Everyday Things You're Probably Doing the Hard Way

Thanks to this article, I am now an expert tipper. I used to use another method, which, to be honest I never really liked unless I was calculating 20 percent. It went like this: First I'd calculate 10 percent of the bill, divide that resulting number in half, add the two together and there it was, the tip amount. So for example 10 percent of a \$24.00 bill is \$2.40. Divide \$2.40 in half to calculate five percent. Add \$2.40 and \$1.20 for \$3.60, a 15 percent tip. Figuring a 20 percent tip takes only two steps. First calculate 10 percent of the bill and then double that number. So, 10 percent of \$24.00 is \$2.40. Double that number -- \$4.80 -- for a 20 percent tip. I'm exhausted just explaining it.

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