-21.24% is the change from 824 to 649
Calculation steps:
[( 649 - 824 ) ÷ 824] x 100 = -21.24%
Formula
Percentage change = [(649 - 824) / 824] x 100
Subtract the new number by the original number
649 - 824 = -175
-175 ÷ 824 = -0.21237864077669902
-0.21237864077669902 x 100 = -21.24%