-21.5% is the change from 828 to 650
Calculation steps:
[( 650 - 828 ) ÷ 828] x 100 = -21.5%
Formula
Percentage change = [(650 - 828) / 828] x 100
Subtract the new number by the original number
650 - 828 = -178
-178 ÷ 828 = -0.21497584541062803
-0.21497584541062803 x 100 = -21.5%