-67.33% is the change from 857 to 280
Calculation steps:
[( 280 - 857 ) ÷ 857] x 100 = -67.33%
Formula
Percentage change = [(280 - 857) / 857] x 100
Subtract the new number by the original number
280 - 857 = -577
-577 ÷ 857 = -0.6732788798133023
-0.6732788798133023 x 100 = -67.33%