-42.71% is the change from 857 to 491
Calculation steps:
[( 491 - 857 ) ÷ 857] x 100 = -42.71%
Formula
Percentage change = [(491 - 857) / 857] x 100
Subtract the new number by the original number
491 - 857 = -366
-366 ÷ 857 = -0.42707117852975496
-0.42707117852975496 x 100 = -42.71%