-40.26% is the change from 857 to 512
Calculation steps:
[( 512 - 857 ) ÷ 857] x 100 = -40.26%
Formula
Percentage change = [(512 - 857) / 857] x 100
Subtract the new number by the original number
512 - 857 = -345
-345 ÷ 857 = -0.4025670945157526
-0.4025670945157526 x 100 = -40.26%