-54.38% is the change from 857 to 391
Calculation steps:
[( 391 - 857 ) ÷ 857] x 100 = -54.38%
Formula
Percentage change = [(391 - 857) / 857] x 100
Subtract the new number by the original number
391 - 857 = -466
-466 ÷ 857 = -0.543757292882147
-0.543757292882147 x 100 = -54.38%