155% is the change from 100 to 255
Calculation steps:
[( 255 - 100 ) ÷ 100] x 100 = 155%
Formula
Percentage change = [(255 - 100) / 100] x 100
Subtract the new number by the original number
255 - 100 = 155
155 ÷ 100 = 1.55
1.55 x 100 = 155%
Example