-85.65% is the change from 857 to 123
Calculation steps:
[( 123 - 857 ) ÷ 857] x 100 = -85.65%
Formula
Percentage change = [(123 - 857) / 857] x 100
Subtract the new number by the original number
123 - 857 = -734
-734 ÷ 857 = -0.8564760793465578
-0.8564760793465578 x 100 = -85.65%