-98.95% is the change from 857 to 9
Calculation steps:
[( 9 - 857 ) ÷ 857] x 100 = -98.95%
Formula
Percentage change = [(9 - 857) / 857] x 100
Subtract the new number by the original number
9 - 857 = -848
-848 ÷ 857 = -0.9894982497082847
-0.9894982497082847 x 100 = -98.95%