178% is the change from 50 to 139
Calculation steps:
[( 139 - 50 ) ÷ 50] x 100 = 178%
Formula
Percentage change = [(139 - 50) / 50] x 100
Subtract the new number by the original number
139 - 50 = 89
89 ÷ 50 = 1.78
1.78 x 100 = 178%
Example