-41.42% is the change from 857 to 502
Calculation steps:
[( 502 - 857 ) ÷ 857] x 100 = -41.42%
Formula
Percentage change = [(502 - 857) / 857] x 100
Subtract the new number by the original number
502 - 857 = -355
-355 ÷ 857 = -0.41423570595099185
-0.41423570595099185 x 100 = -41.42%