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Its probably a worldwide thing, as specialisation and technology have made things harder to fix and find someone who can fix it. I doubt that schools even teach the logic behind most maths/trig nowadays - I really admire the engineers in the 19th Century who built things without cadcam, calculators and even slide rules.
A few years ago I was a supermarket and the bill came to exactly $100, I handed over a $100 bill. The cashier then rang for assistance as the till did not show her how much change she should give me after keying in the $100.
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