-62.54% is the change from 857 to 321
Calculation steps:
[( 321 - 857 ) ÷ 857] x 100 = -62.54%
Formula
Percentage change = [(321 - 857) / 857] x 100
Subtract the new number by the original number
321 - 857 = -536
-536 ÷ 857 = -0.6254375729288215
-0.6254375729288215 x 100 = -62.54%