853.49% is the change from 86 to 820
Calculation steps:
[( 820 - 86 ) ÷ 86] x 100 = 853.49%
Formula
Percentage change = [(820 - 86) / 86] x 100
Subtract the new number by the original number
820 - 86 = 734
734 ÷ 86 = 8.534883720930232
8.534883720930232 x 100 = 853.49%