-22.79% is the change from 838 to 647
Calculation steps:
[( 647 - 838 ) ÷ 838] x 100 = -22.79%
Formula
Percentage change = [(647 - 838) / 838] x 100
Subtract the new number by the original number
647 - 838 = -191
-191 ÷ 838 = -0.22792362768496421
-0.22792362768496421 x 100 = -22.79%