-97.85% is the change from 839 to 18
Calculation steps:
[( 18 - 839 ) ÷ 839] x 100 = -97.85%
Formula
Percentage change = [(18 - 839) / 839] x 100
Subtract the new number by the original number
18 - 839 = -821
-821 ÷ 839 = -0.9785458879618594
-0.9785458879618594 x 100 = -97.85%