100% is the change from 139 to 278
Calculation steps:
[( 278 - 139 ) ÷ 139] x 100 = 100%
Formula
Percentage change = [(278 - 139) / 139] x 100
Subtract the new number by the original number
278 - 139 = 139
139 ÷ 139 = 1
1 x 100 = 100%
Example