12800% is the change from 1 to 129
Calculation steps:
[( 129 - 1 ) ÷ 1] x 100 = 12800%
Formula
Percentage change = [(129 - 1) / 1] x 100
Subtract the new number by the original number
129 - 1 = 128
128 ÷ 1 = 128
128 x 100 = 12800%
Example