it is a denominator of 1 unit
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It is a unit rate.A unit rate.
The unit of rate of change is whatever it is that is changing, divided by time units. For example, if you measure rate of change of dollars in your bank account, you would have something like dollars / month; for acceleration, the unit commonly used is (meters / second) / second, etc.
A banana is a very good example of a nonexample. It has nothing whatsoever to do with rates, and so nothing to do with unit rates.
A rate is something that happens frequently, while a unit rate is an individual digit.
11 is 50% of 22 11 is the portion 50% is the rate 22 is the base The rate is a percent or fraction, the base is the whole unit, and the portion is a part of the base