History
In Ancient Rome, long before the existence of the decimal system, computations were often made in fractions which were multiples of 1/100. For example Augustus levied a tax of 1/100 on goods sold at auction known as centesima rerum venalium. Computation with these fractions were similar to computing percentages. As denominations of money grew in the Middle Ages, computations with a denominator of 100 become more standard and from the late 15th century to the early 16th century it became common for arithmetic texts to include such computations. Many of these texts applied these methods to profit and loss, interest rates, and the Rule of Three. By the 17th century it was standard to quote interest rates in hundredths.
Read more about this topic: Percentage
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