-24.2% is the change from 839 to 636
Calculation steps:
[( 636 - 839 ) ÷ 839] x 100 = -24.2%
Formula
Percentage change = [(636 - 839) / 839] x 100
Subtract the new number by the original number
636 - 839 = -203
-203 ÷ 839 = -0.24195470798569726
-0.24195470798569726 x 100 = -24.2%