-23.51% is the change from 838 to 641
Calculation steps:
[( 641 - 838 ) ÷ 838] x 100 = -23.51%
Formula
Percentage change = [(641 - 838) / 838] x 100
Subtract the new number by the original number
641 - 838 = -197
-197 ÷ 838 = -0.2350835322195704
-0.2350835322195704 x 100 = -23.51%