802.2% is the change from 91 to 821
Calculation steps:
[( 821 - 91 ) ÷ 91] x 100 = 802.2%
Formula
Percentage change = [(821 - 91) / 91] x 100
Subtract the new number by the original number
821 - 91 = 730
730 ÷ 91 = 8.021978021978022
8.021978021978022 x 100 = 802.2%