8000% is the change from 1 to 81
Calculation steps:
[( 81 - 1 ) ÷ 1] x 100 = 8000%
Formula
Percentage change = [(81 - 1) / 1] x 100
Subtract the new number by the original number
81 - 1 = 80
80 ÷ 1 = 80
80 x 100 = 8000%
Example