-90.2% is the change from 847 to 83
Calculation steps:
[( 83 - 847 ) ÷ 847] x 100 = -90.2%
Formula
Percentage change = [(83 - 847) / 847] x 100
Subtract the new number by the original number
83 - 847 = -764
-764 ÷ 847 = -0.9020070838252656
-0.9020070838252656 x 100 = -90.2%