8500% is the change from 1 to 86
Calculation steps:
[( 86 - 1 ) ÷ 1] x 100 = 8500%
Formula
Percentage change = [(86 - 1) / 1] x 100
Subtract the new number by the original number
86 - 1 = 85
85 ÷ 1 = 85
85 x 100 = 8500%
Example