8900% is the change from 1 to 90
Calculation steps:
[( 90 - 1 ) ÷ 1] x 100 = 8900%
Formula
Percentage change = [(90 - 1) / 1] x 100
Subtract the new number by the original number
90 - 1 = 89
89 ÷ 1 = 89
89 x 100 = 8900%
Example