Rhino viruses typically cause common colds. In a test of the effectiveness of echinacea, 34 of the 41 subjects treated with echinacea developed rhinovirus infections. In a placebo group, 96 of the 110 subjects developed rhinovirus infections. What is the percentage of subjects treated with echinacea who developed rhinovirus infections?
1) 82.93%
2) 87.18%
3) 89.47%
4) 92.68%