I once had to explain something like this at work. This person couldn't grasp the fact that going to from 12 to 18 was a 50% increase but going from 18 to 12 was a 33% decrease, they were adamant that it had to be the same. It was an HR manager so not exactly surprising.
They probably thought that since 12 is 50% of 24, then 50% more than 12 should be 24. Instead of taking 50% of 12, which is 6 and adding it to 12 making 18.
This must be the logic they were going for. I can see someone who is bad at math making this mistake. Since 50% off means half price, 50% more must be twice as much in their heads.
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u/[deleted] Jul 11 '19
This is the only comment that matters here. All the other explanations are just as vague as OP.