-23.58% is the change from 844 to 645
Calculation steps:
[( 645 - 844 ) ÷ 844] x 100 = -23.58%
Formula
Percentage change = [(645 - 844) / 844] x 100
Subtract the new number by the original number
645 - 844 = -199
-199 ÷ 844 = -0.235781990521327
-0.235781990521327 x 100 = -23.58%