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"Seriously though, I think many people's brains are just not wired for math. My wife, who is sharp, cannot do math. I have a good friend, a history major, who actually bought a little card to tell him how much a 10%, 15%, or 20% tip would be for a given amount. He could NOT do 15% in his brain. The fact that these little cards are sold means many people can't do math. I'm more forgiving about the math thing than I used to be."
I hate when people can't do tips in their head. move the decimal... then add half of it... and taa daa 15%.
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