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Yes. percentage is a unit for a ratio.

100% ( 100 percent ) equals the normalized form of a ratio of 1/1 (one to one) which is 1.0.

50% ( 50 percent ) equals the normalized form of a ratio of 1/2 (one to two) which is 0.5.

Scaling a value by a normalized ratio can be archived by simple multiplication.

22 * 0.5

Scaling a value by a percentage value can be archived by normalizing the percentage value first by divion by 100:

percentage value / 100 = normalized value

50 / 100 = 0.5

other units for a ratio are:

Per mille (‰) 1 part in 1,000

Basis point (‱) 1 part in 10,000

Per cent mille (pcm) 1 part in 100,000

Parts-per notation

Concentration

Grade (slope)

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Q: Is percentage a unit
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