I feel the 5% and 10% number is an absolute number so whether that number of affected donors donate at the beginning, middle, or end of the donation period should not matter.Either way, at the end of the day, 5% are disqualified and 10% are not detected.Thanks.Sure gmatblows,You just have to recognize the difference between prospective and actual.ex. 100 people are prospective donors. 15% or 15 ha