-21.3% is the change from 845 to 665
Calculation steps:
[( 665 - 845 ) ÷ 845] x 100 = -21.3%
Formula
Percentage change = [(665 - 845) / 845] x 100
Subtract the new number by the original number
665 - 845 = -180
-180 ÷ 845 = -0.21301775147928995
-0.21301775147928995 x 100 = -21.3%