879.12% is the change from 91 to 891
Calculation steps:
[( 891 - 91 ) ÷ 91] x 100 = 879.12%
Formula
Percentage change = [(891 - 91) / 91] x 100
Subtract the new number by the original number
891 - 91 = 800
800 ÷ 91 = 8.791208791208792
8.791208791208792 x 100 = 879.12%