In the early 1980s, hemophiliacs received reconstituted clotting factor concentrates derived from human blood. The concentrates were pooled from the blood of about 1000 donors per lot. If the prevalence of hepatitis C in donor blood in the early 1980s was 1 in 1000, what was the probability that a hemophiliac would contract hepatitis C from a single infusion of clotting factors? Enter as a percentage but do not include the percent sign; round to 1 decimal place.