-89.39% is the change from 839 to 89
Calculation steps:
[( 89 - 839 ) ÷ 839] x 100 = -89.39%
Formula
Percentage change = [(89 - 839) / 839] x 100
Subtract the new number by the original number
89 - 839 = -750
-750 ÷ 839 = -0.8939213349225268
-0.8939213349225268 x 100 = -89.39%