Intriguing.
For me, it is more of manifested in intuitively calculating things in advance so it can't be that accurate, but I do have a rough calculation for each.
I'm not that interested in business regardless the family has pushed me around the bush in doing so, since I'm more into language than math.
As for example, I conjecture calculations by its advantage/disadvantage while akin both prices to each other, as if I knew their price would be when added up. This happened when I bought some foods at store, and didn't really calculate as I just made a categorical assumption in my head.
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