-99.17% is the change from 839 to 7
Calculation steps:
[( 7 - 839 ) ÷ 839] x 100 = -99.17%
Formula
Percentage change = [(7 - 839) / 839] x 100
Subtract the new number by the original number
7 - 839 = -832
-832 ÷ 839 = -0.9916567342073898
-0.9916567342073898 x 100 = -99.17%