For example, if an article costing £100 has 50% off then it now costs £50. Most people I talk to think the 'extra 20%' would be an additional £20 reduction. But they are being misled into thinking this. It is only 20% of the

*reduced price*; that's 20% of £50 in this case, a mere £10.So, 50% off with an additional 20% off is only 60% off in total!

Here's an interesting question. If they reduced the price of something by 10% every day – so every day after the first 10% reduction there is an 'extra 10% off' – assuming no-one buys it, how many days would it take before it costs nothing at all? I'll give the solution some time next week.

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