-88.08% is the change from 839 to 100
Calculation steps:
[( 100 - 839 ) ÷ 839] x 100 = -88.08%
Formula
Percentage change = [(100 - 839) / 839] x 100
Subtract the new number by the original number
100 - 839 = -739
-739 ÷ 839 = -0.8808104886769964
-0.8808104886769964 x 100 = -88.08%