*all*calculators sold worldwide are "tainted".

In what way? For example, the calculators could compute 15% incorrectly -- i.e. if someone wants to know how much a $65 sweater costs at a 15%-off sale, she'd get not $55.25, but, say $56.35. Looks pretty close, right? But with hundreds of millions of items sold with 15% discount, the little errors are going to accumulate to a significant surplus for retailers, which they should be glad to share with the electronics makers.

And suppose some egghead sues them:

Judge: So, Mr. Mathnerd, could you state the nature of your complaint.

Mathnerd: Well, 15% of $65 is $9.75, not $8.65, so 15% off $65 should be $55.25, not $56.35

Judge: And how do you know that?

Mathnerd: I submit to this court exhibit A, which is a Quizno's napkin with my manual calculations. Anyone can do the calculation for themselves and see that I'm right.

Judge: What is this? Some filthy napkin, I'm not touching this! But I can certainly check your math!

Judge pulls a calculator, pushes a few buttons... $56.35!

Mathnerd: But...

Judge: Stop wasting the court's time! Case dismissed!

*Nobody will hear your screams*

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