-89.21% is the change from 139 to 15
Calculation steps:
[( 15 - 139 ) ÷ 139] x 100 = -89.21%
Formula
Percentage change = [(15 - 139) / 139] x 100
Subtract the new number by the original number
15 - 139 = -124
-124 ÷ 139 = -0.8920863309352518
-0.8920863309352518 x 100 = -89.21%