Well, the bizarre thing about this problem is that the function ibanix described is not idempotent. E.g.
f(124)=125 but f(f(124))=150. So it shouldn't really be called a "rounding" function. I don't know if that's really what he wanted, but it is what he asked for.
Abigail's function is more reasonable, but not what ibanix asked for.
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