-21.89% is the change from 845 to 660
Calculation steps:
[( 660 - 845 ) ÷ 845] x 100 = -21.89%
Formula
Percentage change = [(660 - 845) / 845] x 100
Subtract the new number by the original number
660 - 845 = -185
-185 ÷ 845 = -0.21893491124260356
-0.21893491124260356 x 100 = -21.89%