-98.57% is the change from 839 to 12
Calculation steps:
[( 12 - 839 ) ÷ 839] x 100 = -98.57%
Formula
Percentage change = [(12 - 839) / 839] x 100
Subtract the new number by the original number
12 - 839 = -827
-827 ÷ 839 = -0.9856972586412396
-0.9856972586412396 x 100 = -98.57%