-22.99% is the change from 857 to 660
Calculation steps:
[( 660 - 857 ) ÷ 857] x 100 = -22.99%
Formula
Percentage change = [(660 - 857) / 857] x 100
Subtract the new number by the original number
660 - 857 = -197
-197 ÷ 857 = -0.22987164527421236
-0.22987164527421236 x 100 = -22.99%