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Is it fair to say that something is easy, if it isn't easy until you know a detail that makes it easy?
Let's say calculating "10% of 25" in your head is easy. "7% of 25" is hard.
Is calculating "8% of 25" easy or hard?
What if I tell you that multiplication is commutative, and "8% of 25" is the same as "25% of 8"?