What would we retrieve with a search for 100 percent? I seem to have a calculator with 100 percent = 1 from the Google Search Help Centre. And that is the essence of 100%. How did we get to deciding that 100% is complete and whole, with fractions expressed out of 100?
According to Wikipedia, "it starts 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 was equivalent to computing percentages. As denominations of money grew in the Middle Ages, computations with a denominator of 100 became 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."
Different angles of a module at the Narrow Gauge Convention in Minneapolis this year.