How to Do The Duckworth-Lewis Method Calculation?

Who invented percent (%) calculation method and symbol?

• By method, I mean practice of comparing things by converting to common base of 100. Also, who called it "percent" and who assigned symbol "%"?

• Answer:

  It's interesting to see how math symbols are actually relatively new (the = sign was invented in 1557). There's a nice Wiki on percentages, and it appears to have come into use as a natural part of the base 10 number system. Wikipedia highlights: Prior to 1425 there is no evidence of a special symbol being used for percentage. The Italian term per cento, "for a hundred", was used as well as several different abbreviations (e.g. "per 100", "p 100", "p cento", etc.). The "pc" with a loop eventually evolved a horizontal fraction sign by 1650 (see below for an example in a 1684 text[11]) and thereafter lost the "per http://en.wikipedia.org/wiki/Percent_sign