100.78% is the change from 128 to 257
Calculation steps:
[( 257 - 128 ) ÷ 128] x 100 = 100.78%
Formula
Percentage change = [(257 - 128) / 128] x 100
Subtract the new number by the original number
257 - 128 = 129
129 ÷ 128 = 1.0078125
1.0078125 x 100 = 100.78%