-96.66% is the change from 839 to 28
Calculation steps:
[( 28 - 839 ) ÷ 839] x 100 = -96.66%
Formula
Percentage change = [(28 - 839) / 839] x 100
Subtract the new number by the original number
28 - 839 = -811
-811 ÷ 839 = -0.966626936829559
-0.966626936829559 x 100 = -96.66%