It depends on the percentage.
A 1 cm arc of a circle whose radius is 1 cm will represent 100*1/(2pi) % = 50/pi % and that is an irrational percentage.
A semicircular arc of the same circle will represent 50%, which is rational.
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They need not be. You can have sqrt(23)% which would be irrational.
No. A rational plus an irrational is always an irrational.
rational
It is always irrational.
The product of a rational and irrational number can be rational if the rational is 0. Otherwise it is always irrational.