841.76% is the change from 91 to 857
Calculation steps:
[( 857 - 91 ) ÷ 91] x 100 = 841.76%
Formula
Percentage change = [(857 - 91) / 91] x 100
Subtract the new number by the original number
857 - 91 = 766
766 ÷ 91 = 8.417582417582418
8.417582417582418 x 100 = 841.76%