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What is a rate?

While a ralio is a comparison of two quantities that are measured in the same units, a rate is a 'special' ratio that compares two quantities that are measured in different units. Unlike ratios, when writing down rates, you must write down the different units of measurement that are being compared.

Example: . the rate at which a car is travelling is measured in km per hour . electricity is charged at R1,20 per kilowatt . the exchange rate is R17 per Pound
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