-90.46% is the change from 849 to 81
Calculation steps:
[( 81 - 849 ) ÷ 849] x 100 = -90.46%
Formula
Percentage change = [(81 - 849) / 849] x 100
Subtract the new number by the original number
81 - 849 = -768
-768 ÷ 849 = -0.9045936395759717
-0.9045936395759717 x 100 = -90.46%