891% is the change from 100 to 991
Calculation steps:
[( 991 - 100 ) ÷ 100] x 100 = 891%
Formula
Percentage change = [(991 - 100) / 100] x 100
Subtract the new number by the original number
991 - 100 = 891
891 ÷ 100 = 8.91
8.91 x 100 = 891%
Example