84.17% is the change from 139 to 256
Calculation steps:
[( 256 - 139 ) ÷ 139] x 100 = 84.17%
Formula
Percentage change = [(256 - 139) / 139] x 100
Subtract the new number by the original number
256 - 139 = 117
117 ÷ 139 = 0.841726618705036
0.841726618705036 x 100 = 84.17%