REED, H. MUENCH; A SIMPLE METHOD OF ESTIMATING FIFTY PER CENT ENDPOINTS12, American Journal of Epidemiology, Volume 27, Issue 3, 1 May 1938, Pages 493–497 L.J.
If motorists don’t pay their fines before then, the total fine will need to be paid. Percent is not absent from other varieties of English, but most publications still prefer the two-word per cent . Percent vs. per cent The one-word percent is standard in American English. This 25 per cent discount will be valid until the end of 2020.