-20.59% is the change from 845 to 671
Calculation steps:
[( 671 - 845 ) ÷ 845] x 100 = -20.59%
Formula
Percentage change = [(671 - 845) / 845] x 100
Subtract the new number by the original number
671 - 845 = -174
-174 ÷ 845 = -0.20591715976331362
-0.20591715976331362 x 100 = -20.59%