-64.03% is the change from 139 to 50
Calculation steps:
[( 50 - 139 ) ÷ 139] x 100 = -64.03%
Formula
Percentage change = [(50 - 139) / 139] x 100
Subtract the new number by the original number
50 - 139 = -89
-89 ÷ 139 = -0.6402877697841727
-0.6402877697841727 x 100 = -64.03%