-21.74% is the change from 828 to 648
Calculation steps:
[( 648 - 828 ) ÷ 828] x 100 = -21.74%
Formula
Percentage change = [(648 - 828) / 828] x 100
Subtract the new number by the original number
648 - 828 = -180
-180 ÷ 828 = -0.21739130434782608
-0.21739130434782608 x 100 = -21.74%