A rate is a ratio that compares two quantities with different units. It typically expresses how one quantity changes in relation to another. For example, speed is a rate that compares distance to time (miles per hour or kilometers per hour), and interest rates compare the amount of interest earned or paid to the principal amount over a specified period of time (usually expressed as a percentage).
Rates can vary widely in application, including finance (interest rates, exchange rates), health (infection rates, birth rates), and many other fields, but they generally offer a way to express a relationship between two distinct measurements.
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